diff --git a/app/Http/Controllers/Admin/AdminRekomendasiController.php b/app/Http/Controllers/Admin/AdminRekomendasiController.php
index 4fed83b..0ac417e 100644
--- a/app/Http/Controllers/Admin/AdminRekomendasiController.php
+++ b/app/Http/Controllers/Admin/AdminRekomendasiController.php
@@ -64,6 +64,7 @@ public function store(Request $request)
             'deskripsi' => 'required|string',
         ]);
 
+        $validated['user_id'] = auth()->id();
         Recommendation::create($validated);
 
         return redirect()->route('admin.rekomendasi.index')->with('success', 'Rekomendasi berhasil ditambahkan.');
diff --git a/app/Http/Controllers/Admin/BookController.php b/app/Http/Controllers/Admin/BookController.php
index 2d41506..0c2ac71 100644
--- a/app/Http/Controllers/Admin/BookController.php
+++ b/app/Http/Controllers/Admin/BookController.php
@@ -80,12 +80,12 @@ public function edit($id)
     public function store(Request $request)
     {
         $validated = $request->validate([
-            'judul' => 'required|string|max:255',
-            'penulis' => 'required|string|max:255',
+            'judul' => 'required|string|min:3|max:255',
+            'penulis' => 'required|string|min:3|max:100',
             'category_id' => 'required|exists:categories,id',
             'tahun' => 'required|integer',
-            'kode_buku' => 'nullable|string',
-            'stok' => 'required|integer|min:0',
+            'kode_buku' => 'nullable|string|max:10',
+            'stok' => 'required|integer|min:0|max:99',
             'tipe_akses' => 'required|array',
             'cover' => 'nullable|image|mimes:jpeg,png,jpg|max:2048',
             'file_pdf' => 'nullable|mimes:pdf|max:10240',
@@ -111,12 +111,12 @@ public function update(Request $request, $id)
         $buku = Book::findOrFail($id);
 
         $validated = $request->validate([
-            'judul' => 'required|string|max:255',
-            'penulis' => 'required|string|max:255',
+            'judul' => 'required|string|min:3|max:255',
+            'penulis' => 'required|string|min:3|max:100',
             'category_id' => 'required|exists:categories,id',
             'tahun' => 'required|integer',
-            'kode_buku' => 'nullable|string',
-            'stok' => 'required|integer|min:0',
+            'kode_buku' => 'nullable|string|max:10',
+            'stok' => 'required|integer|min:0|max:99',
             'tipe_akses' => 'required|array',
             'cover' => 'nullable|image|mimes:jpeg,png,jpg|max:2048',
             'file_pdf' => 'nullable|mimes:pdf|max:10240',
diff --git a/app/Http/Controllers/Admin/MasterIndukController.php b/app/Http/Controllers/Admin/MasterIndukController.php
index 9968453..365b069 100644
--- a/app/Http/Controllers/Admin/MasterIndukController.php
+++ b/app/Http/Controllers/Admin/MasterIndukController.php
@@ -17,7 +17,7 @@ public function store(Request $request)
             'nama_pemilik' => 'required|string',
         ]);
 
-        MasterInduk::create($request->all());
+        MasterInduk::create(array_merge($request->all(), ['user_id' => auth()->id()]));
 
         return back()->with('success', 'Data Induk berhasil ditambahkan. User dengan NIP/NISN ini sekarang bisa mendaftar.');
     }
diff --git a/app/Http/Controllers/Admin/PengumumanController.php b/app/Http/Controllers/Admin/PengumumanController.php
index 175ad4d..f931e3b 100644
--- a/app/Http/Controllers/Admin/PengumumanController.php
+++ b/app/Http/Controllers/Admin/PengumumanController.php
@@ -57,6 +57,7 @@ public function store(Request $request)
             $validated['icon'] = 'bi-megaphone';
         }
 
+        $validated['user_id'] = auth()->id();
         Announcement::create($validated);
 
         return redirect()->route('admin.pengumuman.index')->with('success', 'Pengumuman berhasil ditambahkan.');
diff --git a/resources/views/admin/buku/create.blade.php b/resources/views/admin/buku/create.blade.php
index 390447e..c6706e8 100644
--- a/resources/views/admin/buku/create.blade.php
+++ b/resources/views/admin/buku/create.blade.php
@@ -19,13 +19,19 @@
                                 <div class="col-md-8">
                                     <div class="mb-3">
                                         <label for="judul" class="form-label">Judul Buku</label>
-                                        <input type="text" name="judul" class="form-control" id="judul"
-                                            placeholder="Masukkan judul buku" required>
+                                        <input type="text" name="judul" class="form-control @error('judul') is-invalid @enderror" id="judul"
+                                            placeholder="Masukkan judul buku" value="{{ old('judul') }}" minlength="3" maxlength="255" required>
+                                        @error('judul')
+                                            <div class="invalid-feedback">{{ $message }}</div>
+                                        @enderror
                                     </div>
                                     <div class="mb-3">
                                         <label for="penulis" class="form-label">Penulis</label>
-                                        <input type="text" name="penulis" class="form-control" id="penulis"
-                                            placeholder="Masukkan nama penulis" required>
+                                        <input type="text" name="penulis" class="form-control @error('penulis') is-invalid @enderror" id="penulis"
+                                            placeholder="Masukkan nama penulis" value="{{ old('penulis') }}" minlength="3" maxlength="100" required>
+                                        @error('penulis')
+                                            <div class="invalid-feedback">{{ $message }}</div>
+                                        @enderror
                                     </div>
                                     <div class="row">
                                         <div class="col-md-3 mb-3">
@@ -48,13 +54,19 @@
                                         </div>
                                         <div class="col-md-3 mb-3">
                                             <label for="kode_buku" class="form-label">Kode Buku</label>
-                                            <input type="text" name="kode_buku" class="form-control" id="kode_buku"
-                                                placeholder="Contoh: 330">
+                                            <input type="text" name="kode_buku" class="form-control @error('kode_buku') is-invalid @enderror" id="kode_buku"
+                                                value="{{ old('kode_buku') }}" placeholder="Contoh: 330" maxlength="10">
+                                            @error('kode_buku')
+                                                <div class="invalid-feedback">{{ $message }}</div>
+                                            @enderror
                                         </div>
                                         <div class="col-md-3 mb-3">
                                             <label for="stok" class="form-label">Stok</label>
-                                            <input type="text" name="stok" class="form-control" id="stok"
-                                                value="1" min="0" required oninput="this.value = this.value.replace(/[^0-9]/g, '')">
+                                            <input type="text" name="stok" class="form-control @error('stok') is-invalid @enderror" id="stok"
+                                                value="{{ old('stok', 1) }}" min="0" max="99" maxlength="2" required oninput="this.value = this.value.replace(/[^0-9]/g, '')">
+                                            @error('stok')
+                                                <div class="invalid-feedback">{{ $message }}</div>
+                                            @enderror
                                         </div>
                                     </div>
                                 </div>
diff --git a/resources/views/admin/buku/edit.blade.php b/resources/views/admin/buku/edit.blade.php
index ab87fdb..7b4f285 100644
--- a/resources/views/admin/buku/edit.blade.php
+++ b/resources/views/admin/buku/edit.blade.php
@@ -20,13 +20,19 @@
                                 <div class="col-md-8">
                                     <div class="mb-3">
                                         <label for="judul" class="form-label">Judul Buku</label>
-                                        <input type="text" name="judul" class="form-control" id="judul"
-                                            value="{{ old('judul', $buku->judul) }}" required>
+                                        <input type="text" name="judul" class="form-control @error('judul') is-invalid @enderror" id="judul"
+                                            value="{{ old('judul', $buku->judul) }}" minlength="3" maxlength="255" required>
+                                        @error('judul')
+                                            <div class="invalid-feedback">{{ $message }}</div>
+                                        @enderror
                                     </div>
                                     <div class="mb-3">
                                         <label for="penulis" class="form-label">Penulis</label>
-                                        <input type="text" name="penulis" class="form-control" id="penulis"
-                                            value="{{ old('penulis', $buku->penulis) }}" required>
+                                        <input type="text" name="penulis" class="form-control @error('penulis') is-invalid @enderror" id="penulis"
+                                            value="{{ old('penulis', $buku->penulis) }}" minlength="3" maxlength="100" required>
+                                        @error('penulis')
+                                            <div class="invalid-feedback">{{ $message }}</div>
+                                        @enderror
                                     </div>
                                     <div class="row">
                                         <div class="col-md-4 mb-3">
@@ -51,8 +57,11 @@
                                         </div>
                                         <div class="col-md-4 mb-3">
                                             <label for="stok" class="form-label">Stok</label>
-                                            <input type="text" name="stok" class="form-control" id="stok"
-                                                value="{{ old('stok', $buku->stok ?? 1) }}" required oninput="this.value = this.value.replace(/[^0-9]/g, '')">
+                                            <input type="text" name="stok" class="form-control @error('stok') is-invalid @enderror" id="stok"
+                                                value="{{ old('stok', $buku->stok ?? 1) }}" min="0" max="99" maxlength="2" required oninput="this.value = this.value.replace(/[^0-9]/g, '')">
+                                            @error('stok')
+                                                <div class="invalid-feedback">{{ $message }}</div>
+                                            @enderror
                                         </div>
                                     </div>
 
@@ -66,8 +75,11 @@
                                     {{-- Field Kode Buku - Hanya untuk Buku Offline --}}
                                     <div class="mb-3" id="kodeBukuWrapper">
                                         <label for="kode_buku" class="form-label">Kode Buku</label>
-                                        <input type="text" name="kode_buku" class="form-control" id="kode_buku"
-                                            value="{{ old('kode_buku', $buku->kode_buku) }}" placeholder="Masukkan kode buku">
+                                        <input type="text" name="kode_buku" class="form-control @error('kode_buku') is-invalid @enderror" id="kode_buku"
+                                            value="{{ old('kode_buku', $buku->kode_buku) }}" placeholder="Masukkan kode buku" maxlength="10">
+                                        @error('kode_buku')
+                                            <div class="invalid-feedback">{{ $message }}</div>
+                                        @enderror
                                     </div>
 
                                     <div class="mb-3">