[Tutor] What do each of these functions do?

[Tom Brodle]

I have requested help related to a program before, but did not see an answer.  I am new to the communicating with "tutor", IE I may have missed the answer.  This time I will simplify my inquiry.
My previous programming has been with "Basic", so please give me a break.
What do the following two lines of code do, individually,  and where in the code does the pointer or (program counter) end up after it has finished that line, assuming it is the last line of code in each of two programs?

GPIO.cleanup()

quit(code=None)

What document would answer my question?

Thanks