For FASM, I really like https://flatassembler.net/docs.php?article=manual https://flatassembler.net/docs.php?article=manual. There are a couple of great books

For FASM, I really like https://flatassembler.net/docs.php?article=manual https://flatassembler.net/docs.php?article=manual. There are a couple of great books out there as well that I have used. I cannot recall their names right now. :(