I've completed four tutorials as of now.
Tutorial 1 introduces the basic structure of a HuC program (introduces #include and main()) and shows how to use put_string(), some color bits, and loading a font.
Tutorial 2 introduces variables, put_number(), and basic C-style calculations.
Tutorial 3 introduces sprites, const arrays, nested for() loops, and random().
Tutorial 4 introduces joypad manipulation, basic background stuff, custom functions, basic logic, and pseudoinstructions.
I'm going to work on this more over the next few days. It's high time we had some good HuC tutorials, so I'll do what I can.