A lot of things.

app/Http/Controllers/ModCP/AuthorController.php

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+<?php
+
+namespace App\Http\Controllers\ModCP;
+
+use App\Helpers\EntryHelpers;
+use App\Http\Controllers\Controller;
+use App\Models\Author;
+use App\Models\Language;
+use App\Rules\XfUserExists;
+use App\Traits\ModCPSearch;
+use Illuminate\Http\Request;
+
+class AuthorController extends Controller
+{
+
+    use ModCPSearch;
+
+    public function index()
+    {
+        $items = Author::withCount('entries')
+            ->orderBy('name')
+            ->tap(fn($query) => $this->applySearch($query, ['name']))
+            ->paginate(30)
+            ->withQueryString();
+
+        return view('modcp.authors', [
+            'items' => $items
+        ]);
+    }
+
+    public function store(Request $request)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:authors,name',
+            'owner_user_id' => [ 'nullable', 'integer', new XfUserExists ],
+            'website' => 'nullable|string|max:255',
+        ]);
+
+        Author::create([
+            'name' => trim( $request->name ),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Author::class ),
+            'user_id' => $request->owner_user_id,
+            'website' => $request->website,
+        ]);
+
+        return back()->with('success', 'Author added.');
+    }
+
+    public function update(Request $request, Author $author)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:authors,name,' . $author->id,
+            'owner_user_id' => [ 'nullable', 'integer', new XfUserExists ],
+            'website' => 'nullable|string|max:255',
+        ]);
+
+        $author->update([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Author::class, $author->id ),
+            'user_id' => $request->owner_user_id,
+            'website' => $request->website,
+        ]);
+
+        return back()->with('success', 'Author updated.');
+    }
+
+    public function destroy(Author $author)
+    {
+        $author->delete();
+        return back()->with('success', 'Author deleted.');
+    }
+}

app/Http/Controllers/ModCP/GameController.php

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+<?php
+
+namespace App\Http\Controllers\ModCP;
+
+use App\Helpers\EntryHelpers;
+use App\Http\Controllers\Controller;
+use App\Models\Game;
+use App\Models\Genre;
+use App\Models\Platform;
+use App\Traits\ModCPSearch;
+use Illuminate\Http\Request;
+
+class GameController extends Controller
+{
+
+    use ModCPSearch;
+
+    public function index()
+    {
+        $items = Game::withCount('entries')->orderBy('name')
+            ->tap(fn($query) => $this->applySearch($query, ['name']))
+            ->paginate(30)->withQueryString();
+        $platforms = Platform::orderBy('name')->get();
+        $genres = Genre::orderBy('name')->get();
+
+        return view('modcp.games', [
+            'items' => $items,
+            'platforms' => $platforms,
+            'genres' => $genres,
+        ]);
+
+    }
+
+    public function store(Request $request)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255',
+            'platform_id' => 'required|integer|exists:platforms,id',
+            'genre_id'    => 'required|integer|exists:genres,id',
+        ]);
+
+        Game::create([
+            'name' => trim($request->name),
+            'platform_id' => $request->platform_id,
+            'genre_id' => $request->genre_id,
+            'slug' => EntryHelpers::uniqueSlug($request->name, Game::class),
+        ]);
+
+        return back()->with('success', 'Game added.');
+    }
+
+    public function update(Request $request, Game $game)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255',
+            'platform_id' => 'required|integer|exists:platforms,id',
+            'genre_id' => 'required|integer|exists:genres,id'
+        ]);
+
+        $game->update([
+            'name' => trim($request->name),
+            'platform_id' => $request->platform_id,
+            'genre_id' => $request->genre_id,
+            'slug' => EntryHelpers::uniqueSlug($request->name, Game::class, $game->id),
+        ]);
+
+        return back()->with('success', 'Game updated.');
+    }
+
+    public function destroy(Game $game)
+    {
+        $game->delete();
+        return back()->with('success', 'Game deleted.');
+    }
+}

app/Http/Controllers/ModCP/GenreController.php

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+<?php
+
+namespace App\Http\Controllers\ModCP;
+
+use App\Helpers\EntryHelpers;
+use App\Http\Controllers\Controller;
+use App\Models\Genre;
+use App\Models\Language;
+use App\Traits\ModCPSearch;
+use Illuminate\Http\Request;
+
+class GenreController extends Controller
+{
+
+    use ModCPSearch;
+
+    public function index()
+    {
+        $items = Genre::withCount('games')
+            ->orderBy('name')
+            ->tap(fn($query) => $this->applySearch($query, ['name']))
+            ->paginate(30)
+            ->withQueryString();
+
+        return view('modcp.resources', [
+            'items' => $items,
+            'title' => 'Genres',
+            'singular' => 'Genre',
+            'storeRoute' => 'modcp.genres.store',
+            'updateRoute' => 'modcp.genres.update',
+            'destroyRoute' => 'modcp.genres.destroy'
+        ]);
+    }
+
+    public function store(Request $request)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:genres,name',
+        ]);
+
+        Genre::create([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Genre::class ),
+        ]);
+
+        return back()->with('success', 'Genre added.');
+    }
+
+    public function update(Request $request, Genre $genre)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:genres,name,' . $genre->id,
+        ]);
+
+        $genre->update([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Genre::class, $genre->id ),
+        ]);
+
+        return back()->with('success', 'Genre updated.');
+    }
+
+    public function destroy(Genre $genre)
+    {
+        $genre->delete();
+        return back()->with('success', 'Genre deleted.');
+    }
+}

app/Http/Controllers/ModCP/LanguageController.php

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+<?php
+
+namespace App\Http\Controllers\ModCP;
+
+use App\Helpers\EntryHelpers;
+use App\Http\Controllers\Controller;
+use App\Models\Language;
+use App\Traits\ModCPSearch;
+use Illuminate\Http\Request;
+
+class LanguageController extends Controller
+{
+
+    use ModCPSearch;
+
+    public function index()
+    {
+        $items = Language::withCount('entries')
+            ->orderBy('name')
+            ->tap(fn($query) => $this->applySearch($query, ['name']))
+            ->paginate(30)
+            ->withQueryString();
+
+        return view('modcp.resources', [
+            'items' => $items,
+            'title' => 'Languages',
+            'singular' => 'Language',
+            'storeRoute' => 'modcp.languages.store',
+            'updateRoute' => 'modcp.languages.update',
+            'destroyRoute' => 'modcp.languages.destroy'
+        ]);
+    }
+
+    public function store(Request $request)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:languages,name',
+        ]);
+
+        Language::create([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Language::class ),
+        ]);
+
+        return back()->with('success', 'Language added.');
+    }
+
+    public function update(Request $request, Language $language)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:languages,name,' . $language->id,
+        ]);
+
+        $language->update([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Language::class, $language->id ),
+        ]);
+
+        return back()->with('success', 'Language updated.');
+    }
+
+    public function destroy(Language $language)
+    {
+        $language->delete();
+        return back()->with('success', 'Language deleted.');
+    }
+}

app/Http/Controllers/ModCP/PlatformController.php

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+<?php
+
+namespace App\Http\Controllers\ModCP;
+
+use App\Helpers\EntryHelpers;
+use App\Http\Controllers\Controller;
+use App\Models\Platform;
+use App\Models\Language;
+use App\Traits\ModCPSearch;
+use Illuminate\Http\Request;
+
+class PlatformController extends Controller
+{
+
+    use ModCPSearch;
+
+    public function index()
+    {
+        $items = Platform::withCount(['games','entries'])
+            ->orderBy('name')
+            ->tap(fn($query) => $this->applySearch($query, ['name']))
+            ->paginate(30)
+            ->withQueryString();
+
+        return view('modcp.resources', [
+            'items' => $items,
+            'title' => 'Platforms',
+            'singular' => 'Platform',
+            'storeRoute' => 'modcp.platforms.store',
+            'updateRoute' => 'modcp.platforms.update',
+            'destroyRoute' => 'modcp.platforms.destroy'
+        ]);
+    }
+
+    public function store(Request $request)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:platforms,name',
+        ]);
+
+        Platform::create([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Platform::class ),
+        ]);
+
+        return back()->with('success', 'Platform added.');
+    }
+
+    public function update(Request $request, Platform $platform)
+    {
+        $request->validate([
+            'name' => 'required|string|max:255|unique:platforms,name,' . $platform->id,
+        ]);
+
+        $platform->update([
+            'name' => trim($request->name),
+            'slug' => EntryHelpers::uniqueSlug( $request->name, Platform::class, $platform->id ),
+        ]);
+
+        return back()->with('success', 'Platform updated.');
+    }
+
+    public function destroy(Platform $platform)
+    {
+        $platform->delete();
+        return back()->with('success', 'Platform deleted.');
+    }
+}