Not what you asked, but what resources did you use to get into this space? Was it just CrackMe or were there others?
Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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First I learned how to program in c (recently I learned c++). Then I learned how to read assembly, how pc memory works, what is dynamic and static linking, what are vtables, and for debugging I learned how to use tools like ghidra, Detect It Easy, xdbg, etc...
Learned about compression, un/packing, dll injection, anti-debug methods.
Also did some simple game hacking, nothing fancy.
It's not all but I can't write everything here... I don't know any good RE courses (maybe someone else here can share).
I also read a lot of writeups on reddit from r/ReverseEngineering and r/REGames