Try solving some crackme's. They're binary executables of various difficulty (with rated difficulty), where the goal ranges from finding a hardcoded password to

Try solving some crackme's. They're binary executables of various difficulty (with rated difficulty), where the goal ranges from finding a hardcoded password to making a keygen to patching the executable. They used to be more popular, but I'm guessing you can still find tutorials on how to get started and solve a simple one.