diff --git a/core/templates/core/community-list.html b/core/templates/core/community-list.html
index 0732c013..d865ca71 100644
--- a/core/templates/core/community-list.html
+++ b/core/templates/core/community-list.html
@@ -8,6 +8,9 @@ <h1>Communities</h1>
         {% for community in communities %}
         <a href="{% url 'community-detail' community.slug %}" class="list-group-item list-group-item-action">
             {{ community.name }}
+            {% if not community.has_access %}
+            <span class="private-community" title="Private Community - No Access">🔒</span>
+            {% endif %}
         </a>
         {% empty %}
         <p>No communities available.</p>
diff --git a/core/tests/test_views.py b/core/tests/test_views.py
index 6129ffb5..654f94b5 100644
--- a/core/tests/test_views.py
+++ b/core/tests/test_views.py
@@ -268,7 +268,7 @@ def test_reported_detail_post_by_user(client: Client, user: User, post: Post, re
     client.force_login(user)
     response = client.get(reverse("reported-post", kwargs={"pk": post.pk}))
     assert response.status_code == 403
-    assert "<h1>403 Forbidden</h1>" in response.content.decode()
+    assert "You don't have access to this community." in response.content.decode()
 
 
 def test_reported_detail_post_by_anonymous_user(client: Client, post_report: PostReport) -> None:
@@ -554,3 +554,21 @@ def test_add_non_existing_moderator(client: Client, community: Community, user:
 
     messages = list(response.context["messages"])
     assert any("Invalid user or nickname." in message.message for message in messages)
+
+
+def test_remove_non_existing_moderator(client: Client, community: Community, user: User) -> None:
+    admin_password = generate_random_password()
+
+    admin = User.objects.create_user(email="admin@example.com", password=admin_password, nickname="adminnick")
+
+    client.force_login(admin)
+    CommunityMember.objects.create(community=community, user=admin, role=CommunityMember.ADMIN)
+
+    url = reverse("community-detail", kwargs={"slug": community.slug})
+    form_data = {"nickname": user.nickname}
+
+    response = client.post(url, {"action": "remove_moderator", **form_data})
+    assert response.status_code == 200
+
+    messages = list(response.context["messages"])
+    assert any("User is not a moderator of this community." in message.message for message in messages)
diff --git a/core/views.py b/core/views.py
index beafa381..fb8389bd 100644
--- a/core/views.py
+++ b/core/views.py
@@ -6,7 +6,7 @@
 from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
 from django.core.exceptions import ObjectDoesNotExist, PermissionDenied
 from django.db import models
-from django.db.models import QuerySet
+from django.db.models import Exists, OuterRef, QuerySet
 from django.http import Http404, HttpRequest, HttpResponse, HttpResponseRedirect
 from django.shortcuts import get_object_or_404, redirect
 from django.template.loader import render_to_string
@@ -135,6 +135,24 @@ class CommunityListView(ListView):
     context_object_name = "communities"
     paginate_by = 10
 
+    def get_queryset(self: "CommunityListView") -> models.QuerySet:
+        user = self.request.user
+        return (
+            super()
+            .get_queryset()
+            .prefetch_related("members")
+            .annotate(has_access=Exists(CommunityMember.objects.filter(community=OuterRef("pk"), user=user)))
+        )
+
+    def get_context_data(self: "CommunityListView", **kwargs: any) -> dict[str, any]:
+        context = super().get_context_data(**kwargs)
+        communities = context["communities"]
+
+        for community in communities:
+            community.has_access = community.privacy != "30_PRIVATE" or community.has_access
+
+        return context
+
 
 class CommunityCreateView(LoginRequiredMixin, CreateView):
     model = Community
@@ -193,6 +211,7 @@ def post_add_moderator(self: "CommunityDetailView", request: "HttpRequest", *arg
         if add_moderator_form.is_valid():
             user = add_moderator_form.cleaned_data["nickname"]
             self.object.add_moderator(user)
+            messages.success(request, f"{user.nickname} is now a moderator of this community.")
         else:
             messages.error(request, "Invalid user or nickname.")
             return self.get(request, *args, **kwargs)
@@ -203,7 +222,13 @@ def post_remove_moderator(self: "CommunityDetailView", request: "HttpRequest", *
         remove_moderator_form = RemoveModeratorForm(request.POST)
         if remove_moderator_form.is_valid():
             user = remove_moderator_form.cleaned_data["nickname"]
+            if not CommunityMember.objects.filter(
+                community=self.object, user=user, role=CommunityMember.MODERATOR
+            ).exists():
+                messages.error(request, "User is not a moderator of this community.")
+                return self.get(request, *args, **kwargs)
             self.object.remove_moderator(user)
+            messages.success(request, f"{user.nickname} was successfully removed from moderators.")
         else:
             messages.error(request, "Invalid user or nickname.")
             return self.get(request, *args, **kwargs)
@@ -239,6 +264,11 @@ def handle_no_permission(self: "CommunityUpdateView") -> HttpResponse:
         messages.error(self.request, "You do not have permission to update this community.")
         return redirect("community-detail", slug=self.get_object().slug)
 
+    def form_valid(self: "CommunityUpdateView", form: forms.ModelForm) -> HttpResponseRedirect:
+        response = super().form_valid(form)
+        messages.success(self.request, "Community updated successfully.")
+        return response
+
     def get_success_url(self: "CommunityUpdateView") -> str:
         return reverse_lazy("community-detail", kwargs={"slug": self.object.slug})
 
diff --git a/reddit/settings.py b/reddit/settings.py
index 4ec46fdd..9f935b6b 100644
--- a/reddit/settings.py
+++ b/reddit/settings.py
@@ -18,7 +18,6 @@
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
 
-
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/5.0/howto/deployment/checklist/
 
@@ -30,13 +29,11 @@
 
 DEBUG = config("DEBUG")
 
-
 # SECURITY WARNING: don't run with debug turned on in production!
 
 
 ALLOWED_HOSTS = json.loads(config("ALLOWED_HOSTS"))
 
-
 # Application definition
 
 INSTALLED_APPS = [
@@ -86,7 +83,6 @@
 
 WSGI_APPLICATION = "reddit.wsgi.application"
 
-
 # Database
 # https://docs.djangoproject.com/en/5.0/ref/settings/#databases
 
@@ -97,7 +93,6 @@
     },
 }
 
-
 # Password validation
 # https://docs.djangoproject.com/en/5.0/ref/settings/#auth-password-validators
 
@@ -116,7 +111,6 @@
     },
 ]
 
-
 # Internationalization
 # https://docs.djangoproject.com/en/5.0/topics/i18n/
 
@@ -128,7 +122,6 @@
 
 USE_TZ = True
 
-
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/5.0/howto/static-files/
 
@@ -168,6 +161,5 @@
 LIMIT_WARNINGS = 5
 LOGIN_URL = reverse_lazy("login")
 
-
 REST_FRAMEWORK = {"DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination", "PAGE_SIZE": 10}
 DEFAULT_AVATAR_URL = "/media/users_avatars/default.png"
diff --git a/templates/403.html b/templates/403.html
new file mode 100644
index 00000000..98facb58
--- /dev/null
+++ b/templates/403.html
@@ -0,0 +1,13 @@
+{% extends 'base.html' %}
+{% load static %}
+
+{% block content %}
+<div class="container mt-5">
+    <div class="card bg-dark shadow-sm text-light">
+        <div class="card-body">
+            <p class="card-text">You don't have access to this community.</p>
+            <a href="{% url 'community-list' %}" class="btn btn-primary">Back to Community List</a>
+        </div>
+    </div>
+</div>
+{% endblock %}
\ No newline at end of file