Ben Eater delves into 6502 assembly with regard to his bread-board 6502 computer. I recommend anyone interested in assembly do a search (on YouTube) for his series.

I got one of his kits and assembled it while working through his YouTube series.

(I didn't, at the time, continue very far into the assembly course, but perhaps will this Winter when I am hunkered down in the Midwaste with the blizzards beating down on my home.)