This website will teach you C++ Itanium Symbol Name Mangling. Itanium-style mangling is used on a lot of platforms, including Linux.
Since C++ mangling (the entire ABI) is considered stable today, you will be able to use this knowledge forever!
This website consists of many lessons, each teaching you something new about C++ Itanium Mangling. There will be many interactive quizzes at each step to test your knowledge.