diff --git a/core/templates/core/collection_detail.html b/core/templates/core/collection_detail.html
index 069e0ef..0fa9008 100644
--- a/core/templates/core/collection_detail.html
+++ b/core/templates/core/collection_detail.html
@@ -22,15 +22,15 @@
   {% if sections or tag_items %}
     <nav class="collection-toc mb-5" aria-label="{% trans 'Contents' %}">
       <div class="small fw-semibold text-uppercase text-muted mb-2">{% trans "Contents" %}</div>
-      <ol class="mb-0">{% if collection.mode == 'tags' %}{% for item in tag_items %}<li><a href="#item-{{ item.id }}">{{ item.content|truncatechars:90 }}</a></li>{% endfor %}{% else %}{% for section in sections %}<li><a href="#section-{{ section.id }}">{{ section.title|default:section.item.content|truncatechars:90 }}</a></li>{% endfor %}{% endif %}</ol>
+      <ol class="mb-0">{% if collection.mode == 'tags' %}{% for item in tag_items %}<li><a href="#item-{{ item.id }}">{{ item.content|markdown_title|truncatechars:90 }}</a></li>{% endfor %}{% else %}{% for section in sections %}<li><a href="#section-{{ section.id }}">{{ section.title|default:section.item.content|markdown_title|truncatechars:90 }}</a></li>{% endfor %}{% endif %}</ol>
     </nav>
   {% endif %}
 
   <div class="collection-flow content">
     {% if collection.mode == 'tags' %}
-      {% for item in tag_items %}<section id="item-{{ item.id }}" class="collection-flow-section">{{ item|item_markdown }}{% if item.comment %}<div class="text-muted border-start ps-3 mt-3">{{ item.comment|markdown }}</div>{% endif %}</section>{% empty %}<div class="text-center text-muted py-5">{% trans "No notes match the selected tags yet." %}</div>{% endfor %}
+      {% for item in tag_items %}<section id="item-{{ item.id }}" class="collection-flow-section">{{ item|collection_item_markdown }}{% if item.comment %}<div class="text-muted border-start ps-3 mt-3">{{ item.comment|markdown }}</div>{% endif %}</section>{% empty %}<div class="text-center text-muted py-5">{% trans "No notes match the selected tags yet." %}</div>{% endfor %}
     {% else %}
-      {% for section in sections %}<section id="section-{{ section.id }}" class="collection-flow-section">{% if section.title %}<h2>{{ section.title }}</h2>{% endif %}{{ section.item|item_markdown }}{% if section.item.comment %}<div class="text-muted border-start ps-3 mt-3">{{ section.item.comment|markdown }}</div>{% endif %}</section>{% empty %}<div class="text-center text-muted py-5">{% trans "This collection has no sections yet." %}</div>{% endfor %}
+      {% for section in sections %}<section id="section-{{ section.id }}" class="collection-flow-section">{% if section.title %}<h2>{{ section.title }}</h2>{% endif %}{{ section.item|collection_item_markdown }}{% if section.item.comment %}<div class="text-muted border-start ps-3 mt-3">{{ section.item.comment|markdown }}</div>{% endif %}</section>{% empty %}<div class="text-center text-muted py-5">{% trans "This collection has no sections yet." %}</div>{% endfor %}
     {% endif %}
   </div>
 </article>
diff --git a/core/templates/core/collection_manage.html b/core/templates/core/collection_manage.html
index bb22d1e..5b1a529 100644
--- a/core/templates/core/collection_manage.html
+++ b/core/templates/core/collection_manage.html
@@ -18,7 +18,7 @@
   {% if collection.description %}<div class="content lead mb-4">{{ collection.description|markdown }}</div>{% endif %}
 
   {% if sections %}
-    <div class="card item-card mb-4"><div class="card-body"><div class="fw-semibold mb-2">{% trans "Contents" %}</div><ol class="mb-0">{% for section in sections %}<li><a href="#section-{{ section.id }}">{{ section.title|default:section.item.content|truncatechars:90 }}</a></li>{% endfor %}</ol></div></div>
+    <div class="card item-card mb-4"><div class="card-body"><div class="fw-semibold mb-2">{% trans "Contents" %}</div><ol class="mb-0">{% for section in sections %}<li><a href="#section-{{ section.id }}">{{ section.title|default:section.item.content|markdown_title|truncatechars:90 }}</a></li>{% endfor %}</ol></div></div>
   {% endif %}
 
   {% if pending_item %}
@@ -39,8 +39,8 @@
     {% for section in sections %}
       <section id="section-{{ section.id }}" class="card item-card"><div class="card-body">
         <div class="d-flex justify-content-between align-items-start gap-3 mb-3">
-          <h2 class="h3 mb-0">{{ section.title|default:section.item.content|truncatechars:100 }}</h2>
-          <a class="small text-muted" href="{{ section.item.get_absolute_url }}">#{{ section.item.id }}</a>
+          <h2 class="h3 mb-0">{{ section.title|default:section.item.content|markdown_title|truncatechars:100 }}</h2>
+          <div class="d-flex gap-2 align-items-center"><a class="btn btn-sm btn-outline-secondary" href="{% url 'item_editor' section.item.id %}?next={% url 'collection_manage' collection.id %}">{% trans "Edit note" %}</a><a class="small text-muted" href="{{ section.item.get_absolute_url }}">#{{ section.item.id }}</a></div>
         </div>
         <div class="content">{{ section.item|item_markdown }}</div>
         {% if section.item.comment %}<div class="content text-muted border-start ps-3 mt-3">{{ section.item.comment|markdown }}</div>{% endif %}
diff --git a/core/templatetags/markdown_extras.py b/core/templatetags/markdown_extras.py
index 3a39a0e..45950fc 100644
--- a/core/templatetags/markdown_extras.py
+++ b/core/templatetags/markdown_extras.py
@@ -13,7 +13,8 @@ ALLOWED_TAGS = set(bleach.sanitizer.ALLOWED_TAGS) | {
 ALLOWED_ATTRS = {'a': ['href', 'title', 'rel'], 'code': ['class'], 'img': ['src', 'alt', 'title', 'class']}
 FILE_RE = re.compile(r'!\[\[file:(\d+)\]\]')
 FENCE_RE = re.compile(r'^\s*(`{3,}|~{3,})')
-HASH_TAG_AT_LINE_START_RE = re.compile(r'^(#{1,6})(?=\S)')
+HASH_TAG_AT_LINE_START_RE = re.compile(r'^(#{1,6})(?!#)(?=\S)')
+TAG_RE = re.compile(r'(?<!\w)#([\wäöüÄÖÜß-]+)')
 
 
 def require_space_after_markdown_heading(text):
@@ -34,6 +35,26 @@ def require_space_after_markdown_heading(text):
     return '\n'.join(lines)
 
 
+def strip_tags_outside_code(text):
+    """Remove #tags for collection reading view while preserving code."""
+    lines = []
+    fence = None
+    for line in (text or '').splitlines():
+        match = FENCE_RE.match(line)
+        if fence:
+            lines.append(line)
+            if match and match.group(1)[0] == fence[0] and len(match.group(1)) >= len(fence):
+                fence = None
+        elif match:
+            fence = match.group(1)
+            lines.append(line)
+        else:
+            parts = re.split(r'(`[^`]*`)', line)
+            cleaned = ''.join(part if part.startswith('`') and part.endswith('`') else TAG_RE.sub('', part) for part in parts)
+            lines.append(re.sub(r'[ \t]{2,}', ' ', cleaned).strip())
+    return '\n'.join(lines).strip()
+
+
 @register.filter
 def markdown(text):
     html = md.markdown(require_space_after_markdown_heading(text), extensions=['extra', 'sane_lists', 'nl2br'])
@@ -41,8 +62,17 @@ def markdown(text):
 
 
 @register.filter
-def item_markdown(item):
-    text = item.content or ''
+def markdown_title(text):
+    """Return a readable title for Markdown content without heading markers."""
+    for line in (text or '').splitlines():
+        title = line.strip()
+        if title:
+            return strip_tags_outside_code(re.sub(r'^#{1,6}\s+', '', title)).strip()
+    return ''
+
+
+def render_item_markdown(item, hide_tags=False):
+    text = strip_tags_outside_code(item.content) if hide_tags else (item.content or '')
     attachments = {str(a.id): a for a in item.attachments.all()}
 
     def replace(match):
@@ -54,6 +84,16 @@ def item_markdown(item):
     return markdown(FILE_RE.sub(replace, text))
 
 
+@register.filter
+def item_markdown(item):
+    return render_item_markdown(item)
+
+
+@register.filter
+def collection_item_markdown(item):
+    return render_item_markdown(item, hide_tags=True)
+
+
 @register.filter
 def is_image(file_name):
     return str(file_name).lower().split('?')[0].endswith(('.png', '.jpg', '.jpeg', '.gif', '.webp', '.bmp', '.svg'))
diff --git a/core/tests.py b/core/tests.py
index 6564025..13b66e6 100644
--- a/core/tests.py
+++ b/core/tests.py
@@ -2,8 +2,8 @@ from django.contrib.auth import get_user_model
 from django.test import TestCase
 from django.urls import reverse
 
-from .models import Collection, CollectionSection, Item, Tag, Team, TeamMembership, UserPreference
-from .templatetags.markdown_extras import markdown
+from .models import ApiKey, Collection, CollectionSection, Item, Tag, Team, TeamMembership, UserPreference
+from .templatetags.markdown_extras import markdown, markdown_title
 from .views import parse_due_command, parse_quick_content
 
 
@@ -98,15 +98,25 @@ class MarkdownHeadingTests(TestCase):
 
     def test_heading_with_space_remains_a_heading(self):
         self.assertIn('<h1>Project</h1>', str(markdown('# Project')))
+        self.assertIn('<h2>Section</h2>', str(markdown('## Section')))
 
     def test_hash_in_fenced_code_is_unchanged(self):
         rendered = str(markdown('```python\n# comment\n```'))
         self.assertIn('# comment', rendered)
         self.assertNotIn('\\# comment', rendered)
+        self.assertNotIn('<h1>', rendered)
+
+    def test_hash_in_inline_code_is_not_a_heading(self):
+        rendered = str(markdown('```# Das ist Kommentar im Code```'))
+        self.assertIn('<code># Das ist Kommentar im Code</code>', rendered)
+        self.assertNotIn('<h1>', rendered)
 
     def test_underline_is_allowed(self):
         self.assertIn('<u>underlined</u>', str(markdown('<u>underlined</u>')))
 
+    def test_markdown_title_strips_heading_marker(self):
+        self.assertEqual(markdown_title('## Ziel von my2dos\n\nText'), 'Ziel von my2dos')
+
 
 class FormattingToolbarTests(TestCase):
     def test_toolbar_and_shortcuts_are_available(self):
@@ -179,6 +189,21 @@ class TeamItemEditTests(TestCase):
         response = self.client.get(reverse('item_editor', args=[item.id]))
         self.assertContains(response, '<option value="team" selected>', html=False)
 
+    def test_team_item_can_be_made_public_even_with_team_tag(self):
+        item = Item.objects.create(
+            owner=self.user, team=self.team, content='Original #docs', visibility=Item.Visibility.TEAM,
+        )
+        item.sync_metadata()
+
+        response = self.client.post(reverse('item_editor', args=[item.id]), {
+            'content': 'Updated #docs', 'comment': '', 'visibility': Item.Visibility.PUBLIC, 'url': '',
+        })
+
+        self.assertRedirects(response, item.get_absolute_url())
+        item.refresh_from_db()
+        self.assertEqual(item.visibility, Item.Visibility.PUBLIC)
+        self.assertIsNone(item.team)
+
 
 class CollectionTests(TestCase):
     def setUp(self):
@@ -274,8 +299,10 @@ class CollectionTests(TestCase):
         response = self.client.get(collection.get_absolute_url())
         html = response.content.decode()
         self.assertContains(response, 'Tag-Sammlung')
-        self.assertLess(html.index('First #guide'), html.index('Second #guide'))
-        self.assertNotContains(response, 'Ignored #guide')
+        self.assertLess(html.index('First'), html.index('Second'))
+        self.assertNotContains(response, 'First #guide')
+        self.assertNotContains(response, 'Second #guide')
+        self.assertNotContains(response, 'Ignored')
         self.assertContains(response, reverse('collection_edit', args=[collection.id]))
         self.assertNotContains(response, reverse('collection_manage', args=[collection.id]))
 
@@ -294,6 +321,26 @@ class CollectionTests(TestCase):
         self.assertNotContains(response, 'Add existing note')
         self.assertNotContains(response, 'section_id')
 
+    def test_collection_reading_view_hides_note_tags(self):
+        collection = Collection.objects.create(owner=self.user, title='Reading view')
+        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='## Section #tutorial\nText #my2dos and `#code`')
+        CollectionSection.objects.create(collection=collection, item=note, position=0)
+        response = self.client.get(collection.get_absolute_url())
+        self.assertContains(response, '<h2>Section</h2>', html=True)
+        self.assertContains(response, '<code>#code</code>', html=True)
+        self.assertNotContains(response, '#tutorial')
+        self.assertNotContains(response, '#my2dos')
+
+    def test_collection_manage_links_note_editor_back_to_collection(self):
+        collection = Collection.objects.create(owner=self.user, title='Reading view')
+        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='## Section')
+        CollectionSection.objects.create(collection=collection, item=note, position=0)
+        manage_url = reverse('collection_manage', args=[collection.id])
+        response = self.client.get(manage_url)
+        self.assertContains(response, f'{reverse("item_editor", args=[note.id])}?next={manage_url}')
+        self.assertContains(response, '>Section</')
+        self.assertNotContains(response, '>## Section</')
+
     def test_public_collection_is_visible_without_login(self):
         collection = Collection.objects.create(owner=self.user, title='Public', visibility=Item.Visibility.PUBLIC)
         self.client.logout()
@@ -325,6 +372,47 @@ class CollectionTests(TestCase):
         self.assertEqual(note.visibility, Item.Visibility.PUBLIC)
 
 
+class ApiItemFilterTests(TestCase):
+    def setUp(self):
+        self.user = get_user_model().objects.create_user(username='api-filter', password='secret')
+        self.help_tag = Tag.objects.create(name='help')
+        self.api_key = ApiKey.objects.create(owner=self.user, name='Help CLI')
+        self.api_key.tags.add(self.help_tag)
+
+    def create_item(self, content):
+        item = Item.objects.create(owner=self.user, content=content)
+        item.sync_metadata()
+        return item
+
+    def test_api_key_scope_and_request_tags_are_combined(self):
+        matching = self.create_item('Keyboard shortcuts #help #tasten')
+        self.create_item('Git help #help #git')
+        self.create_item('Private keyboard note #tasten')
+
+        response = self.client.get(
+            reverse('api_items'), {'tag': 'tasten', 'tag_mode': 'all'},
+            HTTP_X_API_KEY=self.api_key.token,
+        )
+
+        self.assertEqual(response.status_code, 200)
+        ids = [item['id'] for item in response.json()['items']]
+        self.assertEqual(ids, [matching.id])
+
+    def test_api_items_supports_limit_and_search(self):
+        self.create_item('First #help #shell')
+        second = self.create_item('Second #help #shell keyboard')
+
+        response = self.client.get(
+            reverse('api_items'), {'tag': 'shell', 'q': 'keyboard', 'limit': '1'},
+            HTTP_X_API_KEY=self.api_key.token,
+        )
+
+        self.assertEqual(response.status_code, 200)
+        items = response.json()['items']
+        self.assertEqual(len(items), 1)
+        self.assertEqual(items[0]['id'], second.id)
+
+
 class CopyButtonTests(TestCase):
     def test_item_has_copy_button_with_original_text(self):
         user = get_user_model().objects.create_user(username='tester', password='secret')
diff --git a/core/views.py b/core/views.py
index 9d8087e..e1c8b28 100644
--- a/core/views.py
+++ b/core/views.py
@@ -163,6 +163,8 @@ def user_can_delete_item(user, item):
 def desired_item_scope(item, user, force_private=False):
     if force_private:
         return Item.Visibility.PRIVATE, None
+    if item.visibility == Item.Visibility.PUBLIC:
+        return Item.Visibility.PUBLIC, None
     tag_names = {match.group(1).lower() for match in re.finditer(r'(?<!\w)#([\wäöüÄÖÜß-]+)', item.content)}
     membership = TeamMembership.objects.select_related('team').filter(user=user, team__slug__in=tag_names).first()
     if membership:
@@ -187,6 +189,10 @@ def apply_team_from_tags(item, user, force_private=False):
             item.visibility = Item.Visibility.PRIVATE
         item.save(update_fields=['team', 'visibility', 'updated_at'])
         return
+    if item.visibility == Item.Visibility.PUBLIC:
+        item.team = None
+        item.save(update_fields=['team', 'updated_at'])
+        return
     tag_names = list(item.tags.values_list('name', flat=True))
     membership = TeamMembership.objects.select_related('team').filter(user=user, team__slug__in=tag_names).first()
     if membership:
@@ -980,6 +986,29 @@ def api_item_suggestions(request):
     return JsonResponse({'items': data})
 
 
+def api_items_queryset(request, user, api_key=None):
+    items = visible_items(user, api_key)
+    tags = [tag.strip().lstrip('#').lower() for tag in request.GET.getlist('tag') if tag.strip()]
+    if tags:
+        if request.GET.get('tag_mode') == 'all':
+            for tag in tags:
+                items = items.filter(tags__name=tag)
+        else:
+            items = items.filter(tags__name__in=tags).distinct()
+    q = request.GET.get('q', '').strip()
+    if q:
+        items = items.filter(Q(content__icontains=q) | Q(comment__icontains=q) | Q(url__icontains=q) | Q(tags__name__icontains=q)).distinct()
+    return items
+
+
+def api_items_limit(request):
+    try:
+        limit = int(request.GET.get('limit', 200))
+    except (TypeError, ValueError):
+        limit = 200
+    return max(1, min(limit, 500))
+
+
 def serialize_item(item):
     return {
         'id': item.id,
@@ -1006,7 +1035,8 @@ def serialize_item(item):
 def api_items(request):
     user = request.api_key.owner if request.api_key else request.user
     if request.method == 'GET':
-        return JsonResponse({'items': [serialize_item(i) for i in visible_items(user, request.api_key)[:200]]})
+        items = api_items_queryset(request, user, request.api_key)[:api_items_limit(request)]
+        return JsonResponse({'items': [serialize_item(i) for i in items]})
     data = json.loads(request.body or '{}') if request.content_type == 'application/json' else request.POST
     raw = data.get('content', '')
     raw, command_due_at, _ = parse_due_command(raw)