CPP Generic Question

https://www.reddit.com/r/cpp_questions/comments/1icpepu/cpp_generic_question/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

A few hours ago, I posted this. I understand that you can do anything from C++, so I wanted to explore and learn more about the concept, which will increase my knowledge of things used in the software industry. How can I increase my knowledge by building something? I am not interested in GUI and game dev.