diff --git a/app/routes/threads.py b/app/routes/threads.py
index cba37e8..3b4a1f8 100644
--- a/app/routes/threads.py
+++ b/app/routes/threads.py
@@ -18,7 +18,7 @@ def thread(slug):
     POSTS_PER_PAGE = 10
     thread = Threads.find({"slug": slug})
     if not thread:
-        return "no"
+        return redirect(url_for('topics.all_topics'))
 
     post_count = Posts.count({"thread_id": thread.id})
     page_count = max(math.ceil(post_count / POSTS_PER_PAGE), 1)
@@ -69,12 +69,12 @@ def thread(slug):
 def reply(slug):
     thread = Threads.find({"slug": slug})
     if not thread:
-        return "no"
+        return redirect(url_for('topics.all_topics'))
     user = get_active_user()
     if user.is_guest():
-        return "no"
+        return redirect(url_for('.thread', slug=slug))
     if thread.locked() and not user.is_mod():
-        return "no"
+        return redirect(url_for('.thread', slug=slug))
 
     post_content = request.form['post_content']
     post = create_post(thread.id, user.id, post_content)
@@ -102,10 +102,12 @@ def create_form():
     topic = Topics.find({"id": request.form['topic_id']})
     user = get_active_user()
     if not topic:
-        return "no"
+        flash('Invalid topic', InfoboxKind.ERROR)
+        return redirect(url_for('.create'))
 
     if topic.is_locked and not get_active_user().is_mod():
-        return "no"
+        flash(f'Topic "{topic.name}" is locked', InfoboxKind.ERROR)
+        return redirect(url_for('.create'))
 
     title = request.form['title'].strip()
     now = int(time.time())
@@ -128,8 +130,10 @@ def create_form():
 def lock(slug):
     user = get_active_user()
     thread = Threads.find({'slug': slug})
+    if not thread:
+        return redirect(url_for('topics.all_topics'))
     if not ((thread.user_id == user.id) or user.is_mod()):
-        return 'no'
+        return redirect(url_for('.thread', slug=slug))
     target_op = request.form.get('target_op')
     thread.update({
         'is_locked': target_op
@@ -143,8 +147,10 @@ def lock(slug):
 def sticky(slug):
     user = get_active_user()
     thread = Threads.find({'slug': slug})
+    if not thread:
+        return redirect(url_for('topics.all_topics'))
     if not ((thread.user_id == user.id) or user.is_mod()):
-        return 'no'
+        return redirect(url_for('.thread', slug=slug))
     target_op = request.form.get('target_op')
     thread.update({
         'is_stickied': target_op
@@ -167,12 +173,12 @@ def move(slug):
         'id': new_topic_id
     })
     if not new_topic:
-        return 'no'
+        return redirect(url_for('topics.all_topics'))
     thread = Threads.find({
         'slug': slug
     })
     if not thread:
-        return 'no'
+        return redirect(url_for('topics.all_topics'))
     if new_topic.id == thread.topic_id:
         flash('Thread is already in this topic.', InfoboxKind.ERROR)
         return redirect(url_for('.thread', slug=slug))
@@ -189,7 +195,7 @@ def subscribe(slug):
     user = get_active_user()
     thread = Threads.find({'slug': slug})
     if not thread:
-        return 'no'
+        return redirect(url_for('topics.all_topics'))
     subscription = Subscriptions.find({
         'user_id': user.id,
         'thread_id': thread.id,
@@ -204,11 +210,11 @@ def subscribe(slug):
         })
     elif request.form['subscribe'] == 'unsubscribe':
         if not subscription:
-            return 'no'
+            return redirect(url_for('.thread', slug=slug))
         subscription.delete()
     elif request.form['subscribe'] == 'read':
         if not subscription:
-            return 'no'
+            return redirect(url_for('.thread', slug=slug))
         subscription.update({
             'last_seen': int(time.time())
         })
diff --git a/app/routes/topics.py b/app/routes/topics.py
index dcfaca6..b13a899 100644
--- a/app/routes/topics.py
+++ b/app/routes/topics.py
@@ -51,7 +51,7 @@ def topic(slug):
         "slug": slug
     })
     if not target_topic:
-        return "no"
+        return redirect(url_for('.all_topics'))
 
     threads_count = Threads.count({
         "topic_id": target_topic.id
@@ -77,7 +77,7 @@ def topic(slug):
 def edit(slug):
     topic = Topics.find({"slug": slug})
     if not topic:
-        return "no"
+        return redirect(url_for('.all_topics'))
     return render_template("topics/edit.html", topic=topic)
 
 
@@ -87,7 +87,7 @@ def edit(slug):
 def edit_post(slug):
     topic = Topics.find({"slug": slug})
     if not topic:
-        return "no"
+        return redirect(url_for('.all_topics'))
 
     topic.update({
         "name": request.form.get('name', default = topic.name).strip(),
@@ -104,7 +104,7 @@ def edit_post(slug):
 def delete(slug):
     topic = Topics.find({"slug": slug})
     if not topic:
-        return "no"
+        return redirect(url_for('.all_topics'))
 
     topic.delete()
 
diff --git a/app/routes/users.py b/app/routes/users.py
index e19093b..e9837bb 100644
--- a/app/routes/users.py
+++ b/app/routes/users.py
@@ -269,14 +269,17 @@ def settings_form(username):
 def set_avatar(username):
     user = get_active_user()
     if user.is_guest():
-        return 'no'
+        flash('You must be logged in to perform this action.', InfoboxKind.ERROR)
+        return redirect(url_for('.settings', user.username))
     if 'avatar' not in request.files:
-        return 'no!...'
+        flash('Avatar missing.', InfoboxKind.ERROR)
+        return redirect(url_for('.settings', user.username))
 
     file = request.files['avatar']
 
     if file.filename == '':
-        return 'no..?'
+        flash('Avatar missing.', InfoboxKind.ERROR)
+        return redirect(url_for('.settings', user.username))
 
     file_bytes = file.read()
 
@@ -300,7 +303,8 @@ def set_avatar(username):
             old_avatar.delete()
         return redirect(url_for('.settings', username=user.username))
     else:
-        return 'uhhhh no'
+        flash('Something went wrong. Please try again later.', InfoboxKind.WARN)
+        return redirect(url_for('.settings', user.username))
 
 
 @bp.post('/<username>/clear_avatar')
@@ -308,7 +312,7 @@ def set_avatar(username):
 def clear_avatar(username):
     user = get_active_user()
     if user.is_default_avatar():
-        return 'no'
+        return redirect(url_for('.settings', user.username))
 
     old_avatar = Avatars.find({'id': user.avatar_id})
     user.update({'avatar_id': 1})
@@ -336,9 +340,9 @@ def log_out():
 def confirm_user(user_id):
     target_user = Users.find({"id": user_id})
     if not target_user:
-        return "no"
+        return redirect(url_for('.all_topics'))
     if int(target_user.permission) > PermissionLevel.GUEST.value:
-        return "no"
+        return redirect(url_for('.page', username=target_user.username))
 
     target_user.update({
         "permission": PermissionLevel.USER.value,
@@ -353,9 +357,9 @@ def confirm_user(user_id):
 def mod_user(user_id):
     target_user = Users.find({"id": user_id})
     if not target_user:
-        return "no"
+        return redirect(url_for('.all_topics'))
     if target_user.is_mod():
-        return "no"
+        return redirect(url_for('.page', username=target_user.username))
 
     target_user.update({
         "permission": PermissionLevel.MODERATOR.value,
@@ -369,9 +373,9 @@ def mod_user(user_id):
 def demod_user(user_id):
     target_user = Users.find({"id": user_id})
     if not target_user:
-        return "no"
+        return redirect(url_for('.all_topics'))
     if not target_user.is_mod():
-        return "no"
+        return redirect(url_for('.page', username=target_user.username))
 
     target_user.update({
         "permission": PermissionLevel.USER.value,
@@ -385,9 +389,9 @@ def demod_user(user_id):
 def guest_user(user_id):
     target_user = Users.find({"id": user_id})
     if not target_user:
-        return "no"
+        return redirect(url_for('.all_topics'))
     if target_user.is_mod():
-        return "no"
+        return redirect(url_for('.page', username=target_user.username))
 
     target_user.update({
         "permission": PermissionLevel.GUEST.value,