Another fantastic resource (SDK + example codes): https://www.chibiakumas.com/6502/snes.php

And also accompanied by a book: https://www.amazon.com/gp/product/B08W7DWZB3/

It's awesome. Not many new materials dedicated for good old game console programming. BTW, the book also covers Nintendo, Gameboy, Sega, Atari (!!), etc.