I found tutorials like this [0] one to be pretty useful, since they show how to actually use frameworks like LLVM, and lex/yacc/etc. practically. Note that this one is from 2009, and uses an outdated version of LLVM. Actually following along requires some debugging and digging through documentation, which is also helpful in its own way.
[0] https://gnuu.org/2009/09/18/writing-your-own-toy-compiler/