some progress

app/Http/Controllers/ReadlistController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Book;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+class ReadlistController extends Controller
+{
+    public function __construct()
+    {
+        $this->middleware('auth');
+    }
+
+    /**
+     * Display the user's readlist.
+     */
+    public function index(Request $request)
+    {
+        $user = $request->user();
+        $books = $user->readlistBooks()->with(['category', 'authors', 'summary'])->orderByPivot('created_at', 'desc')->paginate(12);
+
+        return view('readlist.index', [
+            'books' => $books,
+        ]);
+    }
+
+    /**
+     * Add a book to the readlist.
+     */
+    public function store(Request $request, Book $book)
+    {
+        $user = $request->user();
+        $user->readlistBooks()->syncWithoutDetaching([$book->id]);
+
+        if ($request->wantsJson()) {
+            return response()->json(['status' => 'added']);
+        }
+
+        return back()->with('success', 'Book added to your readlist.');
+    }
+
+    /**
+     * Remove a book from the readlist.
+     */
+    public function destroy(Request $request, Book $book)
+    {
+        $user = $request->user();
+        $user->readlistBooks()->detach($book->id);
+
+        if ($request->wantsJson()) {
+            return response()->json(['status' => 'removed']);
+        }
+
+        return back()->with('success', 'Book removed from your readlist.');
+    }
+}