So I posted a thread about this elsewhere without realizing this thread existed. Oops. Anyway, I have recently started a semi instructional video series called "The Joy of ROM Hacking". It's basically Bob Ross but with an offensive ROM Hack rather than a painting. This first video "teaches" simple graphics hacking. Later on there will be more in depth vids that teach how to locate in game text in a hex editor, how to use SMB Title Editor, and how to use Super Mario Utility to its fullest.
Give the first episode a look if youre interested:.https://www.youtube.com/watch?v=oaIvTbdCZQA