I came to the party way to late. A month ago, I found out asmjit was a thing, and now it's happily embedded in my app. But I don't know assembly! I tried to learn a few times since the early 2000s but the timing was never right. But hand written asm as a feature fits perfectly into my upcoming app, so now I am on a roll learning assembly! Here are some more resources I found so far:

https://news.ycombinator.com/item?id=22279051

https://sonictk.github.io/asm_tutorial/#introduction/setting...

https://cs.brown.edu/courses/cs033/docs/guides/x64_cheatshee...

https://people.freebsd.org/~lstewart/articles/cpumemory.pdf

https://learn.microsoft.com/en-us/cpp/build/x64-calling-conv...