State Variables

why it throws error --> function getter() public view returns(int){ number=number+1; return number; } in getter only I am incrementing and returning it.

we type uint with variables only?

If we are declaring a variable in our contract and give it a value in a function or a constructor, will it be considered a state variable?

at 4:17 you don't explain how to comment out so many lines at once, but I figured it out its basically you select all the lines of code you'd like commented out with the mouse, then hold down the control key and press the forward slash key and boom its commented out, had to learn this on my own but my only gripe about the video