What is the best way to learn more about visual programming in C# and in java?

Answer 1

You mean object oriented programming.
Try these resources
https://www.sololearn.com/discuss/636195/?ref=app

Answer 2

I think they're referring to coding a GUI, Manual.
To the OP, I would try a Google search for Java GUI development or the same with C# (I don't know enough about either to give you a good source).
GUI is an acronym for Graphical User Interface.