Slash chords are usualy indicating which version of the chord you need to play. As you will see, going through Kirks' lessons, he talks about basic chord structure. 1.3 and 5 intervals. You can play those chords with the intervals in different orders. The number after the slash indicates which note is the bass note. Depending on melodic need for that chord, some slash chords have a note in the bass not belonging to the chord like Jims' Steely Dan chord. Bbsus2/3. There is no 3 in a sus chord.
C/G is the 5 interval of the Chord played as the lowest note.
G/B. B= 3 interval
D/F#. F#= 3 interval
Hope that clears it up a bit.
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