diff --git a/app/Http/Controllers/Backend/Courses/CourseController.php b/app/Http/Controllers/Backend/Courses/CourseController.php
index 460d0fd..2fcf67c 100644
--- a/app/Http/Controllers/Backend/Courses/CourseController.php
+++ b/app/Http/Controllers/Backend/Courses/CourseController.php
@@ -104,7 +104,8 @@ public function update(Request $request, $id)
             $course->price = $request->coursePrice;
             $course->subscription_price = $request->subscriptionPrice;
             $course->difficulty = $request->courseDifficulty;
-            $course->prerequisites = $request->prerequisites;
+            $course->prerequisites_en = $request->prerequisites_en;
+            $course->prerequisites_bn = $request->prerequisites_bn;
             $course->status = $request->status;
             $course->language = 'en';
 
diff --git a/database/migrations/2023_11_26_153735_create_reviews_table.php b/database/migrations/2023_11_26_153735_create_reviews_table.php
index c8c0cbe..8401ccd 100644
--- a/database/migrations/2023_11_26_153735_create_reviews_table.php
+++ b/database/migrations/2023_11_26_153735_create_reviews_table.php
@@ -13,7 +13,15 @@ public function up(): void
     {
         Schema::create('reviews', function (Blueprint $table) {
             $table->id();
+            $table->unsignedBigInteger('student_id')->index();
+            $table->unsignedBigInteger('course_id')->index();
+            $table->integer('rating');
+            $table->text('comment')->nullable();
             $table->timestamps();
+            $table->softDeletes();
+
+            $table->foreign('student_id')->references('id')->on('students')->onDelete('cascade');
+            $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
         });
     }
 
diff --git a/database/migrations/2023_11_26_153754_create_payments_table.php b/database/migrations/2023_11_26_153754_create_payments_table.php
index d7c31e5..bdd7a28 100644
--- a/database/migrations/2023_11_26_153754_create_payments_table.php
+++ b/database/migrations/2023_11_26_153754_create_payments_table.php
@@ -13,7 +13,18 @@ public function up(): void
     {
         Schema::create('payments', function (Blueprint $table) {
             $table->id();
+            $table->unsignedBigInteger('student_id')->index();
+            $table->unsignedBigInteger('course_id')->index();
+            $table->decimal('amount', 10, 2)->nullable(false);
+            $table->timestamp('payment_date')->useCurrent();
+            $table->string('payment_method');
+            $table->string('transaction_id');
+            $table->enum('status', ['success', 'pending', 'failed'])->default('pending');
             $table->timestamps();
+            $table->softDeletes();
+
+            $table->foreign('student_id')->references('id')->on('students')->onDelete('cascade');
+            $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
         });
     }
 
diff --git a/database/migrations/2023_11_26_153818_create_subscriptions_table.php b/database/migrations/2023_11_26_153818_create_subscriptions_table.php
index eed16ea..0b87ce6 100644
--- a/database/migrations/2023_11_26_153818_create_subscriptions_table.php
+++ b/database/migrations/2023_11_26_153818_create_subscriptions_table.php
@@ -13,7 +13,17 @@ public function up(): void
     {
         Schema::create('subscriptions', function (Blueprint $table) {
             $table->id();
+            $table->unsignedBigInteger('student_id')->index();
+            $table->unsignedBigInteger('course_id')->index();
+            $table->enum('plan', ['monthly', 'yearly'])->nullable(false);
+            $table->timestamp('start_date')->useCurrent();
+            $table->timestamp('end_date')->nullable();
+            $table->enum('status', ['active', 'canceled', 'expired'])->default('active');
             $table->timestamps();
+            $table->softDeletes(); 
+
+            $table->foreign('student_id')->references('id')->on('students')->onDelete('cascade');
+            $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
         });
     }
 
diff --git a/database/migrations/2023_11_26_153844_create_progress_table.php b/database/migrations/2023_11_26_153844_create_progress_table.php
index 02bf3b8..e40067f 100644
--- a/database/migrations/2023_11_26_153844_create_progress_table.php
+++ b/database/migrations/2023_11_26_153844_create_progress_table.php
@@ -13,7 +13,18 @@ public function up(): void
     {
         Schema::create('progress', function (Blueprint $table) {
             $table->id();
+            $table->unsignedBigInteger('student_id')->index();
+            $table->unsignedBigInteger('course_id')->index();
+            $table->integer('progress_percentage')->default(0);
+            $table->boolean('completed')->default(false);
+            $table->unsignedBigInteger('last_viewed_material_id')->index()->nullable();
+            $table->timestamp('last_viewed_at')->nullable();
             $table->timestamps();
+            $table->softDeletes(); 
+
+            $table->foreign('student_id')->references('id')->on('students')->onDelete('cascade');
+            $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
+            $table->foreign('last_viewed_material_id')->references('id')->on('materials')->onDelete('cascade');
         });
     }
 
diff --git a/database/migrations/2023_11_26_153902_create_discussions_table.php b/database/migrations/2023_11_26_153902_create_discussions_table.php
index e1f52e6..f7f0379 100644
--- a/database/migrations/2023_11_26_153902_create_discussions_table.php
+++ b/database/migrations/2023_11_26_153902_create_discussions_table.php
@@ -13,7 +13,15 @@ public function up(): void
     {
         Schema::create('discussions', function (Blueprint $table) {
             $table->id();
+            $table->unsignedBigInteger('user_id')->index();
+            $table->unsignedBigInteger('course_id')->index();
+            $table->string('title', 255)->nullable(false);
+            $table->text('content');
             $table->timestamps();
+            $table->softDeletes(); 
+
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
         });
     }
 
diff --git a/database/migrations/2023_11_26_153916_create_messages_table.php b/database/migrations/2023_11_26_153916_create_messages_table.php
index c82dd59..3ff9a8c 100644
--- a/database/migrations/2023_11_26_153916_create_messages_table.php
+++ b/database/migrations/2023_11_26_153916_create_messages_table.php
@@ -13,7 +13,14 @@ public function up(): void
     {
         Schema::create('messages', function (Blueprint $table) {
             $table->id();
+            $table->unsignedBigInteger('sender_id')->index();
+            $table->unsignedBigInteger('receiver_id')->index();
+            $table->text('content');
             $table->timestamps();
+            $table->softDeletes(); 
+
+            $table->foreign('sender_id')->references('id')->on('users')->onDelete('cascade');
+            $table->foreign('receiver_id')->references('id')->on('users')->onDelete('cascade');
         });
     }
 
diff --git a/resources/views/backend/course/index.blade.php b/resources/views/backend/course/index.blade.php
index be1c823..1e4d101 100644
--- a/resources/views/backend/course/index.blade.php
+++ b/resources/views/backend/course/index.blade.php
@@ -64,7 +64,7 @@
                                             <ul class="list-group mb-3 list-group-flush">
                                                 <li class="list-group-item px-0 d-flex justify-content-between">
                                                     <span>Difficulty</span>
-                                                    <strong>{{ $d->difficulty == 'beginner' ? __('Beginner') : ($d->gender == 'intermediate' ? __('Intermediate') : __('Advanced')) }}</strong>
+                                                    <strong>{{ $d->difficulty == 'beginner' ? __('Beginner') : ($d->difficulty == 'intermediate' ? __('Intermediate') : __('Advanced')) }}</strong>
                                                 </li>
                                                 <li class="list-group-item px-0 d-flex justify-content-between">
                                                     <span class="mb-0">Instructor :</span>