Easy 6502
@ https://skilldrick.github.io/easy6502/
How to get starting writing 6502 assembly language.
6502.org
@ http://www.6502.org/
Resource for writing software for the 6502.
visual 6502
@ http://www.visual6502.org/JSSim/
6502 simulator with visual representation in the browser.
6502asm fantasy console
@ http://www.6502asm.com/
6502 compatible assembler and emulator in javascript .
Godbolt compiler explorer
@ https://godbolt.org/
Get assembler output for various languages and analyse it.
How to read arm64 assembly
@ https://wolchok.org/posts/how-to-read-arm64-assembly-language/
Blog post with some information about arm64. Links to earlier post about asm with x86.