Machine Language for Beginners

I recommend these two books for 6502 assembly: https://archive.org/details/ataribooks-machine-language-for-... (https://archive.org/details/ataribooks-machine-language-for-beginners/mode/2up) and https://archive.org/details/ataribooks-the-second-book-of-ma... (https://archive.org/details/ataribooks-the-second-book-of-machine-language) These two books will give you a good understanding of 6502 assembler - it is general but gives a good background and has a nice assembler with a full walk through of the code. I used these two books to learn 6502 on my Commodore 64 and they are highly recommended.

This is what I read as a middle schooler learning 6502 on a C64. Does a good covering the basics in a very conversational manner.

Machine Language for Beginners, Charles Mansfield https://archive.org/details/ataribooks-machine-language-for-... (https://archive.org/details/ataribooks-machine-language-for-beginners) This book specifically targets beginners that are new to 6502 assembly. The examples cover all of the 1980s-era computers including the Apple II. It's free on archive.org and the introductory chapters are worth reading.