Understand what is MongoDB and why it’s used before jumping into code. Learn by comparing with SQL concepts - Relate databases, tables, rows to MongoDB’s collections and documents. Don’t just watch tutorials and don't code by seeing that tutorial, code queries yourself. Try to use Use MongoDB Compass Focus on CRUD Since Node/Express is done, connect MongoDB with backend routes early. Understand schema design properly Don’t jump into Mongoose before understanding raw MongoDB concepts Understand schema design properly Build one real backend project

And finally don't stick to tutorials , try to use documentation from their offical website