Hello there 17 year old,
im 17 to
uuhm how i learned c++ was reading tutorials online and studying how a base works.
cplusplus.com - The C++ Resources Network this site can also be used to study.
Btw if you want to hack a game you also need to know assembly, without assembly you can't find any adresses and you WILL be detected.
Goodluck, if there is any question feel free to ask them.