Strum the open strings - that's Aminor 7.
Barre the first fret - that's Bbminor 7.
Now the second fret - that's Bminor 7.
The third is Cminor 7.
Just keep going up the fret board, and you've learned at least a dozen new chords!
Music is easy, innit?
John C.
Edit:- I've just noticed this query is under "Guitar Discussion". Sorry, I was referring to a uke tuned GCEA. As Seeso pointed out, all the minor 7 chords have an equivalent 6 name also. So that's now at least two dozen new chords!