Soooo I finished watching all of Bucky's tutorials on LibGDX, and I decided to try to make a game(I instantly encountered an hindrance). The first thing I tried to develop is the menu, and I couldn't really understand how different parts of the menu were shown.

For example, if I clicked Options in a menu, it would show Sound, Graphics, etc. In order to do this, what must be done? Should the second part of the menu be an entirely different Activity, or is there a method that removes and adds buttons? Would .dispose() work, and how would it be implemented?

Thanks in advance to anyone who helps me!

P.S. I'm a real newb at developing. I have coding experience, but Java just blows my mind.
I also searched throughout the other topics, but most of them dealt with android studio problems :P