If you want to do something Web based and already got some experience there, PHP is a good direction to go with plenty of help and examples online. It is used in most of my websites and it's a good core skill as a web developer, which you can expand on as you get more experience.

Personally if you wanted to do more with C++, maybe my experience could help, I venture into game engine development after I learnt C++ (many game engines are built or based on it). The unreal engine was a good start for me as it is quiet flexible in what you can modify code wise. If you feel brave then you can even build your own.