I'm starting to learn reverse engineering and while doing that I have had to read a bunch of assembly but also write a small amount too. I don't use NASM and am

I'm starting to learn reverse engineering and while doing that I have had to read a bunch of assembly but also write a small amount too. I don't use NASM and am only writing a few instructions at a time, mainly either updating an existing instruction or replacing an instruction with one or more that are the same size