I switched to C++ a few months ago, learning its syntax, the main features of the STL and what you can usually find in a "learn C++" manual.

Now I would like to go further. What would be your recommendations? I would like to know what to learn next (not only about the language, but also debugging, frameworks etc. etc.) I know probably the answer depends on the specific needs of each user, so here is a list of mine:

• Cross Platform development
• Developing GUI for my programs
• Develop extendible software, allowing the use of plugins
• Use of scientific libraries
• Interact with databases (mainly MySQL)
• Having server/client functionalities (I'd like users of my programs to interact through internet.. as you might have guessed I am not a programmer by training so I might have used the wrong terms.. if so I apologize for that).

Of course I know it takes time, but I would like to have a good list of references and resources to start (both books and websites are ok).

Thanks a lot for your help!