The Official Docs are full of useful tutorials, organized by topic in the sidebar. In addition, the Step by step section introduces lots of information about how to use the engine, including a full beginner-level game, "Dodge the Creeps".
Content is regularly being added here. For example, the 3D FPS tutorial has a PR that was just posted, and the "Using KinematicBody2D" tutorial was recently added.
Finally, this page contains a list of community tutorials, both text- and video-based.
If you have a specific tutorial idea or request, the best thing you can do is post an issue for discussion on the godot-docs Github repository.