help with joystick

I was trying to make a joysick using an arduino leonardo I have a few potentometers I have tried to find some tutorials but I can't find a good explination of the code they mostly seem to say hook this thing here and use this code.

is there anywhere that explanes what each of the codes do?

A common joystick is mainly two different pots and sometimes a button or two.
What is the difficulty in reading those devices?

The USB protocols and descriptors are quite . . . obscure.

I'd use the supplied code, and work back to gain an understanding

ok thanks.

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