4/4 Is four counts of the quarter note receiving 1 count. So 4/4 is four quarternotes to a measure. The beat is the strong pulses of the music, and in 4/4 those are usually on 1 and 3 (when the kick drum is typically played), but this usually confuses people because the metronome calls it "Beats per minute" which is not how we typically use it. The TEMPO is the rate at which you count, or the PULSE. If you wanted to be technically correct it would be 120 PULSES per minute. So that would be 120 counts per minute, or 30 groups of 4/4 (meaures) per minute.

So if you set your metronome to 120, every click would be a number: 1, 2, 3, 4, 1, 2, 3, 4...

The "eighth" notes would be counted in between the clicks

1 and 2 and 3 and 4

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