If you understand the basic principal, then it should make it easy to learn.
The sweep (X) or the trace from left to right is TIME, and the verticle (Y) is AMPLITUDE, this can be a + or - figure with ref to the base line, We won't mention the Z at this point.
For example if you wanted to display one cycle of the AC from a low voltage secondary for e.g. the trace time for 1 cycle is 1/60 = 16ms. you would set the TIME trace for say 2ms/div, the amplitude or input volts/division to suit the amplitude of the signal, if the signal was 10v and you set the display for 1v/div then it would display one cycle of the sine wave 10 divs high.