What Requirements do I need for DBO Server Programming?

Hi all, can someone tell me what c++ knowledge do I need to start programming or developing a DBO Server?

I have looked at some server projects in previous releases in this forum and have noticed that they use the MySQL server from XAMPP (so I did some information gathering)

I have previous knowledge in the matter, such as:
- C++ OOP (Obviously)
- C++ Sockets
- some C++ MFC ((not much) and no API yet, but I do know some concepts)
- Basic PHP and SQL

I know there is more to learn about, but what is it?

can someone PLS mention some c++ topics that I need to learn and will help me in this topic... (and some tutorials if possible :):)

Thanks in advance...