diff --git a/app/controllers/AuthController.php b/app/controllers/AuthController.php
index f188111..bc361b5 100644
--- a/app/controllers/AuthController.php
+++ b/app/controllers/AuthController.php
@@ -1,19 +1,68 @@
 <?php
 
-class AuthController {
+class AuthController extends Controller  {
     public function signin() {
-        $view = new View();
-        $data = [
-            'title' => 'Log In'
-        ];
-        $view->render('auth/signin', $data);
+        if($_SERVER['REQUEST_METHOD'] === 'POST') {
+            $email = $_POST['email'] ?? '';
+            $password = $_POST['password'] ?? '';
+
+            $user = new User();
+            $result = $user->login($email, $password);
+
+            if($result === true) {
+                $this->redirect('/dashboard');
+            } else {
+                $this->view('auth/signin', ['error' => $result]);
+            }
+        } else {
+            $this->view('auth/signin', ['title' => 'Log In']);
+        }
     }
-    
+
     public function signup() {
-        $view = new View();
-        $data = [
-            'title' => 'Register'
-        ];
-        $view->render('auth/signup', $data);
-    }   
+        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+            $username = $_POST['username'] ?? '';
+            $email = $_POST['email'] ?? '';
+            $password = $_POST['password'] ?? '';
+            $password2 = $_POST['password-2'] ?? '';
+
+            // Perform validations
+            $validator = new Validator();
+
+            $validator->required('username', $username);
+            $validator->email('email', $email);
+            $validator->required('password', $password);
+            $validator->minLength('password', $password, 8);
+            $validator->alphanumeric('password', $password);
+
+            if ($password !== $password2) {
+                $validator->errors()['password_confirmation'] = 'Passwords do not match.';
+            }
+
+            if (!$validator->passes()) {
+                $this->view('auth/signup', [
+                    'error' => 'Please correct the errors below.',
+                    'validationErrors' => $validator->errors() ?: [],
+                ]);
+                return;
+            }
+
+            $user = new User();
+            $result = $user->register($username, $email, $password);
+
+            if ($result === true) {
+                $this->redirect('/auth/signin');
+            } else {
+                $this->view('auth/signup', [
+                    'error' => $result,
+                    'validationErrors' => [],
+                ]);
+            }
+        } else {
+            $this->view('auth/signup', [
+                'title' => 'Register',
+                'validationErrors' => [],
+            ]);
+        }
+    }
 }
diff --git a/app/models/User.php b/app/models/User.php
new file mode 100644
index 0000000..d860b58
--- /dev/null
+++ b/app/models/User.php
@@ -0,0 +1,45 @@
+<?php
+
+require_once '../core/Database.php';
+
+class User {
+    private $db;
+
+    public function __construct() {
+        $this->db = Database::getInstance()->getConnection();
+
+        if ($this->db) {
+            error_log("Database connection established successfully.");
+        } else {
+            error_log("Failed to connect to the database.");
+        }
+    }
+
+    public function register($username, $email, $password) {
+        // Check if email already exists
+        $stmt = $this->db->prepare("SELECT id FROM users WHERE email = ?");
+        $stmt->bind_param("s", $email);
+        $stmt->execute();
+        $result = $stmt->get_result();
+        $stmt->close();
+
+        if ($result->num_rows > 0) {
+            return "Email is already registered";
+        }
+
+        // Hash the password
+        $hashedPassword = password_hash($password, PASSWORD_BCRYPT);
+
+        $stmt = $this->db->prepare("INSERT INTO users (username, email, password, points, created_at) VALUES (?, ?, ?, 0, NOW())");
+        $stmt->bind_param("sss", $username, $email, $hashedPassword);
+
+        if ($stmt->execute()) {
+            return true;
+        } else {
+            return "Error: " . $stmt->error;
+        }
+    }
+}
+
+?>
+
diff --git a/app/views/auth/signup.php b/app/views/auth/signup.php
index d55a20f..b937291 100644
--- a/app/views/auth/signup.php
+++ b/app/views/auth/signup.php
@@ -1,11 +1,33 @@
 <section class="signup">
-  <form>
-    <label for="username">Username</label>
-    <input type="text" name="username" id="username">
-    <label for="password">Password</label>
-    <input type="password" name="password" id="password">
-    <label for="password-2">Password again</label>
-    <input type="password" name="password-2" id="password-2">
-    <input type="submit" value="Sign Up" id="submit-signup">
-  </form>
+    <?php if ($this->get('error')): ?>
+        <div class="error"><?= $this->get('error') ?></div>
+    <?php endif; ?>
+
+    <form action="/auth/signup" method="POST">
+        <label for="username">Username</label>
+        <input type="text" name="username" id="username" value="<?= htmlspecialchars($_POST['username'] ?? '') ?>" required>
+        <?php if (isset($this->get('validationErrors')['username'])): ?>
+            <small class="error"><?= $this->get('validationErrors')['username'] ?></small>
+        <?php endif; ?>
+
+        <label for="email">Email</label>
+        <input type="email" name="email" id="email" value="<?= htmlspecialchars($_POST['email'] ?? '') ?>" required>
+        <?php if (isset($this->get('validationErrors')['email'])): ?>
+            <small class="error"><?= $this->get('validationErrors')['email'] ?></small>
+        <?php endif; ?>
+
+        <label for="password">Password</label>
+        <input type="password" name="password" id="password" required>
+        <?php if (isset($this->get('validationErrors')['password'])): ?>
+            <small class="error"><?= $this->get('validationErrors')['password'] ?></small>
+        <?php endif; ?>
+
+        <label for="password-2">Password again</label>
+        <input type="password" name="password-2" id="password-2" required>
+        <?php if (isset($this->get('validationErrors')['password_confirmation'])): ?>
+            <small class="error"><?= $this->get('validationErrors')['password_confirmation'] ?></small>
+        <?php endif; ?>
+
+        <input type="submit" value="Sign Up">
+    </form>
 </section>
diff --git a/config/.gitignore b/config/.gitignore
new file mode 100644
index 0000000..abf5021
--- /dev/null
+++ b/config/.gitignore
@@ -0,0 +1 @@
+environment.php
diff --git a/core/Controller.php b/core/Controller.php
index e69de29..5715db7 100644
--- a/core/Controller.php
+++ b/core/Controller.php
@@ -0,0 +1,23 @@
+<?php
+class Controller {
+    /**
+     * Redirect to a given URL
+     *
+     * @param string $url
+     */
+    public function redirect($url) {
+        header("Location: $url");
+        exit();
+    }
+
+    /**
+     * Render a view
+     *
+     * @param string $viewName
+     * @param array $data
+     */
+    public function view($viewName, $data = []) {
+        $view = new View();
+        $view->render($viewName, $data);
+    }
+}
diff --git a/core/Database.php b/core/Database.php
new file mode 100644
index 0000000..8bbde03
--- /dev/null
+++ b/core/Database.php
@@ -0,0 +1,101 @@
+<?php
+
+class Database {
+    private static $instance = null;
+    private $connection;
+
+    private function __construct() {
+        $this->initializeConnection();
+        $this->checkAndCreateDatabase();
+        $this->checkAndCreateTables();
+    }
+
+    /**
+     * Get the singleton instance of the Database
+     * @return Database
+     */
+    public static function getInstance() {
+        if (self::$instance === null) {
+            self::$instance = new Database();
+        }
+
+        return self::$instance;
+    }
+
+    /**
+     * Get the active database connection
+     * @return mysqli
+     */
+    public function getConnection() {
+        return $this->connection;
+    }
+
+    /**
+     * Initialize the connection to the database
+     */
+    private function initializeConnection() {
+        $this->connection = new mysqli(DB_HOST, DB_USER, DB_PASS);
+
+        if ($this->connection->connect_error) {
+            die("Database connection failed: " . $this->connection->connect_error);
+        }
+    }
+
+    /**
+     * Check and create the database if it doesn't exist
+     */
+    private function checkAndCreateDatabase() {
+        $query = "CREATE DATABASE IF NOT EXISTS `" . DB_NAME . "`";
+        if (!$this->connection->query($query)) {
+            die("Failed to create or access database: " . $this->connection->error);
+        }
+
+        $this->connection->select_db(DB_NAME);
+    }
+
+    /**
+     * Check and create required tables if they don't exist
+     */
+    private function checkAndCreateTables() {
+        // Create users table
+        $usersTableQuery = "CREATE TABLE IF NOT EXISTS users (
+            id INT AUTO_INCREMENT PRIMARY KEY,
+            username VARCHAR(50) NOT NULL,
+            email VARCHAR(100) NOT NULL UNIQUE,
+            password VARCHAR(255) NOT NULL,
+            points INT DEFAULT 0,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        ) ENGINE=InnoDB;";
+
+        if (!$this->connection->query($usersTableQuery)) {
+            die("Failed to create users table: " . $this->connection->error);
+        }
+
+        // Create progress table
+        $progressTableQuery = "CREATE TABLE IF NOT EXISTS progress (
+            id INT AUTO_INCREMENT PRIMARY KEY,
+            user_id INT NOT NULL,
+            habit_id INT NOT NULL,
+            date DATE NOT NULL,
+            status ENUM('Done', 'Pending') DEFAULT 'Pending',
+            FOREIGN KEY (user_id) REFERENCES users(id)
+        ) ENGINE=InnoDB;";
+
+        if (!$this->connection->query($progressTableQuery)) {
+            die("Failed to create progress table: " . $this->connection->error);
+        }
+
+        // Add more table creation logic as needed
+    }
+
+    /**
+     * Prevent cloning of the singleton instance
+     */
+    private function __clone() {}
+
+    /**
+     * Prevent unserialization of the singleton instance
+     */
+    public function __wakeup() {}
+
+}
diff --git a/core/Validator.php b/core/Validator.php
new file mode 100644
index 0000000..ed5bdc5
--- /dev/null
+++ b/core/Validator.php
@@ -0,0 +1,55 @@
+<?php
+
+class Validator {
+    private $errors = [];
+
+    /**
+     * Check if a field is not empty
+     */
+    public function required($field, $value, $message = null) {
+        if (empty(trim($value))) {
+            $this->errors[$field] = $message ?? "$field is required.";
+        }
+    }
+
+    /**
+     * Check if a field meets minimum length
+     */
+    public function minLength($field, $value, $length, $message = null) {
+        if (strlen($value) < $length) {
+            $this->errors[$field] = $message ?? "$field must be at least $length characters.";
+        }
+    }
+
+    /**
+     * Check if a field contains letters and numbers
+     */
+    public function alphanumeric($field, $value, $message = null) {
+        if (!preg_match('/^(?=.*[a-zA-Z])(?=.*\d).+$/', $value)) {
+            $this->errors[$field] = $message ?? "$field must contain letters and numbers.";
+        }
+    }
+
+    /**
+     * Validate an email
+     */
+    public function email($field, $value, $message = null) {
+        if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
+            $this->errors[$field] = $message ?? "Invalid email format.";
+        }
+    }
+
+    /**
+     * Get validation errors
+     */
+    public function errors() {
+        return $this->errors;
+    }
+
+    /**
+     * Check if validation passed
+     */
+    public function passes() {
+        return empty($this->errors);
+    }
+}
diff --git a/core/View.php b/core/View.php
index 4cc6fb9..03a79ed 100644
--- a/core/View.php
+++ b/core/View.php
@@ -1,10 +1,11 @@
 <?php
 class View
 {
-    public function render($view, $data = [], $layout = 'base')
-    {
-        // Extract variables to be accessible in the view
-        extract($data);
+    private $data = [];
+
+    public function render($view, $data = [], $layout = 'base') {
+        // Store the data 
+        $this->data = $data;
 
         // Capture the view content
         ob_start();
@@ -12,6 +13,13 @@ class View
         $content = ob_get_clean();
 
         // Include the base layout and inject the view content
-        require_once  views . "layouts/$layout.php";
+        require_once views . "layouts/$layout.php";
+    }
+
+    /**
+     * Safely get a value from the data array
+     */
+    public function get($key) {
+        return $this->data[$key] ?? null;
     }
 }
diff --git a/public/index.php b/public/index.php
index cf5aa12..eb90184 100644
--- a/public/index.php
+++ b/public/index.php
@@ -7,10 +7,17 @@ ini_set('error_log', '../storage/logs/error_log.log');
 define('models', __DIR__ . '/../app/models/');
 define('views', __DIR__ . '/../app/views/');
 define('controllers', __DIR__ . '/../app/controllers/');
+define('config', __DIR__ . '/../config/');
 
+require_once config . 'environment.php';
+
+require_once '../core/Validator.php';
 require_once '../core/Router.php';
 require_once '../core/View.php';
 require_once '../core/Controller.php';
+require_once '../core/Database.php';
+
+require_once models . 'User.php';
 
 // Initialize router
 $router = new Router();