diff --git a/functions/communityFunctions.js b/functions/communityFunctions.js
new file mode 100644
index 0000000..f6770c1
--- /dev/null
+++ b/functions/communityFunctions.js
@@ -0,0 +1,82 @@
+import {pool} from '../db.js';
+
+export const createNewCommunity = async (req, res) => {
+    try {
+        const { nombre, descripcion } = req.body;
+        const query = await pool.query(
+            `INSERT INTO comunidad (nombre, descripcion) 
+             VALUES ($1, $2)
+                RETURNING *`,
+            [nombre, descripcion]
+        );
+        res.status(201).json(query.rows[0]);
+    } catch (err) {
+        console.error('Error creating community:', err);
+        res.status(500).json({
+            error: 'Error al crear la comunidad: ' + err.message
+        });
+    }
+}
+
+export const getCommunityById = async (req, res) => {
+    try {
+        const { id_comunidad } = req.params;
+        const query = await pool.query(
+            `SELECT * FROM comunidad
+                WHERE id_comunidad = $1`,
+            [id_comunidad]
+        );
+        res.json(query.rows[0]);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+
+export const getAllCommunities = async (req, res) => {
+    try {
+        const query = await pool.query(
+            `SELECT * FROM comunidad
+             ORDER BY nombre ASC`
+        );
+        res.json(query.rows);
+    }
+    catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+
+export const editCommunity = async (req, res) => {
+    try {
+        const { id_comunidad } = req.params;
+        const { nombre, descripcion } = req.body;
+        const query = await pool.query(
+            'UPDATE comunidad SET nombre = $1, descripcion = $2 WHERE id_comunidad = $3 RETURNING *',
+            [nombre, descripcion, id_comunidad]
+        );
+        res.json(query.rows[0]);
+    }
+    catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+
+export const deleteCommunity = async (req, res) => {
+    try {
+        const { id_comunidad } = req.params;
+        const query = await pool.query(
+            'DELETE FROM comunidad WHERE id_comunidad = $1 RETURNING *',
+            [id_comunidad]
+        );
+        res.json(query.rows[0]);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
\ No newline at end of file
diff --git a/functions/offerFunctions.js b/functions/offerFunctions.js
new file mode 100644
index 0000000..c016dc7
--- /dev/null
+++ b/functions/offerFunctions.js
@@ -0,0 +1,87 @@
+import {pool} from '../db.js';
+
+export const createNewOffer = async (req, res) => {
+    try {
+        const { nombre, descripcion, precio, id_usuario } = req.body;
+        let imagePath = null;
+        if (req.processedFilename) {
+            imagePath = `/uploads/${req.processedFilename}`;
+        }
+        const query = await pool.query(
+            `INSERT INTO oferta (nombre, descripcion, precio, imagen, fecha_publicacion, id_usuario) 
+             VALUES ($1, $2, $3, $4, NOW(), $5)
+                RETURNING *`,
+            [nombre, descripcion, precio, imagePath, id_usuario]
+        );
+        res.status(201).json(query.rows[0]);
+    } catch (err) {
+        console.error('Error creating offer:', err);
+        res.status(500).json({
+            error: 'Error al crear la oferta: ' + err.message
+        });
+    }
+}
+
+export const getOfferById = async (req, res) => {
+    try {
+        const { id_oferta } = req.params;
+        const query = await pool.query(
+            `SELECT usuarios.nombre, usuarios.apellido_pa, usuarios.apellido_ma, oferta.*
+             FROM oferta
+                JOIN usuarios ON oferta.id_usuario = usuarios.id_usuario
+                WHERE id_oferta = $1`,
+            [id_oferta]
+        );
+        res.json(query.rows[0]);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+export const getAllOffers = async (req, res) => {
+    try {
+        const query = await pool.query(
+            `SELECT usuarios.nombre, usuarios.apellido_pa, usuarios.apellido_ma, oferta.*
+                FROM oferta
+                JOIN usuarios ON oferta.id_usuario = usuarios.id_usuario
+                ORDER BY oferta.fecha_publicacion DESC`
+        );
+        res.json(query.rows);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+
+export const editOffer = async (req, res) => {
+    try {
+        const { id_oferta } = req.params;
+        const { nombre, descripcion, precio } = req.body;
+        const query = await pool.query(
+            'UPDATE oferta SET nombre = $1, descripcion = $2, precio = $3 WHERE id_oferta = $4 RETURNING *',
+            [nombre, descripcion, precio, id_oferta]
+        );
+        res.json(query.rows[0]);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+
+export const deleteOffer = async (req, res) => {
+    try {
+        const { id_oferta } = req.params;
+        const query = await pool.query(
+            'DELETE FROM oferta WHERE id_oferta = $1 RETURNING *',
+            [id_oferta]
+        );
+        res.json(query.rows[0]);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
\ No newline at end of file
diff --git a/functions/postFunctions.js b/functions/postFunctions.js
index e09b21b..0cc8ede 100644
--- a/functions/postFunctions.js
+++ b/functions/postFunctions.js
@@ -3,7 +3,7 @@ import {pool} from '../lib/database.js';
 
 export const createNewPost = async (req, res) => {
     try {
-        const { contenido, id_usuario } = req.body;
+        const { contenido, id_usuario, comunidad } = req.body;
         
         if (!contenido || !id_usuario) {
             return res.status(400).json({ 
@@ -19,10 +19,10 @@ export const createNewPost = async (req, res) => {
 
         // Create the post in the database
         const query = await pool.query(
-            `INSERT INTO posts (contenido, imagen, id_usuario, fecha_publicacion) 
-             VALUES ($1, $2, $3, NOW()) 
+            `INSERT INTO posts (contenido, imagen, id_usuario, fecha_publicacion, comunidad) 
+             VALUES ($1, $2, $3, NOW(), $4) 
              RETURNING *`,
-            [contenido, imagePath, id_usuario]
+            [contenido, imagePath, id_usuario, comunidad]
         );
 
         // Get the created post with user information
@@ -62,6 +62,26 @@ export const getPostById = async (req, res) => {
     }
 }
 
+getPostByComunityId = async (req, res) => {
+    try {
+        const { comunidad } = req.params;
+        const query = await pool.query(
+            `SELECT usuarios.nombre, usuarios.apellido_pa, usuarios.apellido_ma, posts.*
+             FROM posts
+             JOIN usuarios ON posts.id_usuario = usuarios.id_usuario
+             WHERE comunidad = $1
+             ORDER BY fecha_publicacion DESC`,
+            [comunidad]
+        );
+        res.json(query.rows);
+    }
+    catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+        throw err;
+    }
+}
+
 export const deletePost = async (req, res) => {
     try {
         const { id_post } = req.params;
diff --git a/routes/communities.js b/routes/communities.js
new file mode 100644
index 0000000..697cc11
--- /dev/null
+++ b/routes/communities.js
@@ -0,0 +1,18 @@
+import {Router} from 'express';
+import { createCommunity, getCommunityById, getAllCommunities, deleteCommunity, editCommunity } from '../functions/communityFunctions.js';
+const router = Router();
+
+// Validate create community payload
+const validateCommunityPayload = (req, res, next) => {
+    const { nombre, descripcion } = req.body;
+    if (!nombre || !descripcion) {
+        return res.status(400).json({ error: 'nombre and descripcion are required' });
+    }
+    next();
+};
+
+router.post('/', validateCommunityPayload, createCommunity);
+router.get('/', getAllCommunities);
+router.get('/:id_comunidad', getCommunityById);
+router.put('/:id_comunidad', validateCommunityPayload, editCommunity);
+router.delete('/:id_comunidad', deleteCommunity);
\ No newline at end of file
diff --git a/routes/offers.js b/routes/offers.js
new file mode 100644
index 0000000..aacf618
--- /dev/null
+++ b/routes/offers.js
@@ -0,0 +1,81 @@
+import { Router } from "express";
+import { createNewOffer, getOfferById, deleteOffer, getAllOffers, getOffersByUserId, editOffer } from "../functions/offerFunctions.js";
+const router = Router();
+
+const storage = multer.memoryStorage();
+
+const fileFilter = (req, file, cb) => {
+  if (file.mimetype.startsWith('image/')) {
+    cb(null, true);
+  } else {
+    cb(new Error('Solo se permiten imágenes'), false);
+  }
+};
+
+const upload = multer({
+  storage: storage,
+  fileFilter: fileFilter,
+  limits: {
+    fileSize: 5 * 1024 * 1024 // 5MB limit
+  }
+});
+
+async function processImage(file) {
+    const imagePath = path.join(process.cwd(), 'uploads');
+
+    const buffer = file.buffer;
+    const hash = crypto.createHash('sha256').update(buffer).digest('hex');
+    const mime = await fileTypeFromBuffer(buffer).then(type => type?.mime);
+    
+    // Validate MIME type
+    if (!mime || !['image/jpeg', 'image/png', 'image/gif', 'image/webp'].includes(mime)) {
+        throw new Error('Unsupported image format');
+    }
+
+    // File save name and path if not GIF
+    let filename;
+    if (mime === 'image/gif') {
+        filename = `${hash}.gif`;
+        await fs.writeFile(path.join(imagePath, filename), buffer);
+    } else {
+        filename = `${hash}.webp`;
+        await sharp(buffer)
+            .resize({ width: 800, height: 800, fit: 'inside', withoutEnlargement: true })
+            .rotate()
+            .normalise()
+            .withMetadata()
+            .toFormat('webp', { quality: 80 })
+            .toFile(path.join(imagePath, filename));
+    }
+    return filename;
+}
+
+const processUploadedImage = async (req, res, next) => {
+    try {
+        if (req.file) {
+            const filename = await processImage(req.file);
+            req.processedFilename = filename;
+        }
+        next();
+    } catch (error) {
+        console.error('Error processing image:', error);
+        res.status(400).json({ error: 'Error al procesar la imagen: ' + error.message });
+    }
+};
+
+
+// Validate create offer payload
+const validateOfferPayload = (req, res, next) => {
+    const { nombre, descripcion, precio, id_usuario } = req.body;
+    if (!nombre || !descripcion || !precio || !id_usuario) {
+        return res.status(400).json({ error: 'nombre, descripcion, precio and id_usuario are required' });
+    }
+    next();
+};
+
+router.post('/', upload.single('imagen'), validateOfferPayload, processUploadedImage, createNewOffer);
+router.get('/', getAllOffers);
+router.get('/:id_oferta', getOfferById);
+router.put('/:id_oferta', upload.single('imagen'), validateOfferPayload, processUploadedImage, editOffer);
+router.delete('/:id_oferta', deleteOffer);
+router.get('/user/:id_usuario', getOffersByUserId);
\ No newline at end of file