In my opinion, cgborn has the best beginner tutorials for Godot on Youtube. If you need to know the complete basics or are a complete beginner, he has two Godot courses, one for 2D and the other for 3D. If you're more advanced or if you've already finished these tutorials, then you can improve your knowledge and learn some more tools and concepts from KidsCanCode or GDquest or the other well-known tutorial channels.