Hello.
First, find out what a period is. (A period is a place where it begins to repeat itself - by peasant reason

) See how you have set the time base on the oscilloscope and see how many divisions takes a period and when you know, use the formula f = 1 / T. Where t is the duration of the period

The filling is also spoxik because if it is a square wave, use the formula: ww = (ti / t) * 100%

where ti is the pulse duration and t is nothing but the waveform duration

And as for the amplitude, let the others get tired