or more practice, that's where
Where, where... in the IDE! :)
Come up with your task and write it under the program. Get practice hands. Without having to actually write a piece of code from a textbook, and a full work program to go into advanced books is not worth it.
The program can be arbitrarily useless (for example, the file chooser sorting on the button these files in the order found in the names of numbers). The main thing - to bring it to working condition.