diff --git a/code/backend/src/controllers/feedController.ts b/code/backend/src/controllers/feedController.ts
index d202f7f..e6c7c54 100644
--- a/code/backend/src/controllers/feedController.ts
+++ b/code/backend/src/controllers/feedController.ts
@@ -2,11 +2,12 @@ import express, { Request, Response } from "express";
 import { StatusCodes } from "http-status-codes";
 import { PrismaClient, Post } from "../../prisma/app/generated/prisma/client";
 import { feedQuerySchema } from "../schemas/feedSchemas";
+import { z } from "zod";
 const prisma = new PrismaClient();
 export const feed = async (req: Request, res: Response) => {
   try {
     const query = feedQuerySchema.parse(req.query);
-    const take = query.limit || 10;
+    const take = query.limit;
 
     const posts = await prisma.post.findMany({
       take: take + 1,
@@ -25,6 +26,13 @@ export const feed = async (req: Request, res: Response) => {
 
     res.status(200).json({ posts, nextCursor });
   } catch (err) {
+    if (err instanceof z.ZodError) {
+      res.status(400).json({
+        error: "Invalid query parameters",
+        details: err.errors,
+      });
+      return;
+    }
     console.error(err);
     res.status(400).json({ error: "Invalid query parameters" });
   }
diff --git a/code/backend/src/controllers/followerController.ts b/code/backend/src/controllers/followerController.ts
index bab2056..8911985 100644
--- a/code/backend/src/controllers/followerController.ts
+++ b/code/backend/src/controllers/followerController.ts
@@ -3,6 +3,7 @@ import express, { Request, Response } from "express";
 import { JwtPayload } from "jsonwebtoken";
 import { PrismaClient, Follow } from "../../prisma/app/generated/prisma/client";
 const prisma = new PrismaClient();
+
 export const followUser = async (req: Request, res: Response) => {
   const username: string = req.params.username;
   const followingUser: JwtPayload = req.user!;
@@ -27,7 +28,7 @@ export const followUser = async (req: Request, res: Response) => {
       });
       return;
     }
-    if (user.username == username) {
+    if (user.id == followingUser.sub) {
       res.status(StatusCodes.BAD_REQUEST).json({
         error: "Bad Request",
         details: [{ message: "You can`t follow yourself" }],
diff --git a/code/backend/src/controllers/postController.ts b/code/backend/src/controllers/postController.ts
index 6bbb15f..1b79d0b 100644
--- a/code/backend/src/controllers/postController.ts
+++ b/code/backend/src/controllers/postController.ts
@@ -4,7 +4,6 @@ import { StatusCodes } from "http-status-codes";
 import { JwtPayload } from "jsonwebtoken";
 import { PrismaClient, Post } from "../../prisma/app/generated/prisma/client";
 import { minioClient } from "../server";
-import { object } from "zod";
 import { uploadPostSchema } from "../schemas/postSchemas";
 dotenv.config();
 const prisma = new PrismaClient();
@@ -190,11 +189,20 @@ export const getPost = async (req: Request, res: Response) => {
 // get all posts from a user
 export const getUserPosts = async (req: Request, res: Response) => {
   try {
+    const user: JwtPayload | undefined = req.user;
     const username: string = req.params.username;
     const posts = await prisma.post.findMany({
       where: {
+        ...(user
+          ? {
+              OR: [
+                { status: "PRIVATE", userId: user.id },
+                { status: "PUBLIC" },
+              ],
+            }
+          : { status: "PUBLIC" }),
         user: {
-          username: username, // hier greifst du auf die relationierte User-Tabelle zu
+          username: username,
         },
       },
     });
@@ -329,3 +337,31 @@ export const removeLike = async (req: Request, res: Response) => {
     });
   }
 };
+
+export const getTags = async (req: Request, res: Response) => {
+  try {
+    const tags = await prisma.tag.findMany({
+      take: 150,
+      include: {
+        _count: {
+          select: {
+            posts: true,
+          },
+        },
+      },
+      orderBy: {
+        posts: {
+          _count: "desc",
+        },
+      },
+    });
+    const data: string[] = tags.map((tag) => tag.name);
+    res.status(StatusCodes.OK).json(data);
+  } catch (err) {
+    console.error(err);
+    res.status(StatusCodes.INTERNAL_SERVER_ERROR).json({
+      error: "Failed to retrieve tags",
+      details: [{ message: "Internal server error" }],
+    });
+  }
+};
diff --git a/code/backend/src/controllers/profileController.ts b/code/backend/src/controllers/profileController.ts
index ba88950..3ce1644 100644
--- a/code/backend/src/controllers/profileController.ts
+++ b/code/backend/src/controllers/profileController.ts
@@ -19,6 +19,7 @@ type PublicUser = {
   profilePictureUrl: string | null;
   followers: number;
   following: number;
+  posts: number;
 };
 const getUser: (userId: string) => Promise<PublicUser | undefined> = async (
   userId: string
@@ -47,6 +48,11 @@ const getUser: (userId: string) => Promise<PublicUser | undefined> = async (
         followingUserId: userId,
       },
     });
+    const postCount = await prisma.post.count({
+      where: {
+        userId: userId,
+      },
+    });
     const publicUser: PublicUser = {
       id: user.id,
       username: user.username,
@@ -54,6 +60,7 @@ const getUser: (userId: string) => Promise<PublicUser | undefined> = async (
       profilePictureUrl,
       followers: followerCount,
       following: followingCount,
+      posts: postCount,
     };
     return publicUser;
   }
diff --git a/code/backend/src/routes/postRoutes.ts b/code/backend/src/routes/postRoutes.ts
index e9556bb..303eea1 100644
--- a/code/backend/src/routes/postRoutes.ts
+++ b/code/backend/src/routes/postRoutes.ts
@@ -1,6 +1,7 @@
 import express from "express";
 import {
   getPost,
+  getTags,
   getUserPosts,
   like,
   removeLike,
@@ -156,4 +157,29 @@ router.post("/like/:postId", authenticateToken(), like);
  */
 router.delete("/removeLike/:postId", authenticateToken(), removeLike);
 
+/**
+ * @swagger
+ * /api/posts/tags:
+ *   get:
+ *     summary: Get posttags
+ *     description: Returns posttags
+ *     tags:
+ *       - Posts
+ *     responses:
+ *       200:
+ *         description: List of tags
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 tags:
+ *                   type: array
+ *                   items:
+ *                     type: string
+ *       500:
+ *         description: Server error
+ */
+router.get("/tags", getTags);
+
 export default router;
diff --git a/code/backend/src/routes/profileRoutes.ts b/code/backend/src/routes/profileRoutes.ts
index ffc8fc2..61ff87a 100644
--- a/code/backend/src/routes/profileRoutes.ts
+++ b/code/backend/src/routes/profileRoutes.ts
@@ -8,7 +8,7 @@ import {
 } from "../controllers/profileController";
 const profileRouter = express.Router();
 import { upload } from "../middleware/uploadSingle";
-import { updateBioSchema } from "../schemas/feedSchemas";
+import { updateBioSchema } from "../schemas/profileSchemas";
 import { validateData } from "../middleware/validationMiddleware";
 /**
  * @swagger
@@ -97,7 +97,7 @@ profileRouter.get("/getProfilePicture/:username", getProfilePicture);
  *       401:
  *         description: Unauthorized
  */
-profileRouter.post(
+profileRouter.put(
   "/updateBio",
   authenticateToken(),
   validateData(updateBioSchema),
@@ -105,7 +105,7 @@ profileRouter.post(
 );
 /**
  * @swagger
- * /api/profile/get/{username}:
+ * /api/profile/{username}:
  *   get:
  *     summary: Get user data
  *     tags: [Profile]
@@ -124,5 +124,5 @@ profileRouter.post(
  *       401:
  *         description: Ungültige Anmeldedaten
  */
-profileRouter.get("/get/:username", getProfile);
+profileRouter.get("/:username", getProfile);
 export default profileRouter;
diff --git a/code/backend/src/schemas/feedSchemas.ts b/code/backend/src/schemas/feedSchemas.ts
index 4c21275..eb0fca8 100644
--- a/code/backend/src/schemas/feedSchemas.ts
+++ b/code/backend/src/schemas/feedSchemas.ts
@@ -1,4 +1,4 @@
-import { string, z } from "zod";
+import { z } from "zod";
 
 export const feedQuerySchema = z.object({
   createdAt: z.string().datetime().optional(),
@@ -7,9 +7,5 @@ export const feedQuerySchema = z.object({
     .transform((val) => parseInt(val, 10))
     .refine((num) => num > 0 && num <= 30, {
       message: "Limit must be between 1 and 30",
-    })
-    .optional(),
-});
-export const updateBioSchema = z.object({
-  bio: z.string(),
+    }),
 });
diff --git a/code/backend/src/schemas/profileSchemas.ts b/code/backend/src/schemas/profileSchemas.ts
new file mode 100644
index 0000000..4f491e0
--- /dev/null
+++ b/code/backend/src/schemas/profileSchemas.ts
@@ -0,0 +1,4 @@
+import { z } from "zod";
+export const updateBioSchema = z.object({
+  bio: z.string(),
+});