how to learn TABS

e
B
G          These are your 6 strings "e" is the top string, the high E-note, and "E" is the bottom string, the low E-note. 
D          The numbers you see are the fret you play that particular string on.  Like this:
A         
E       

e                          3             
B                      0                 
G                0                       
D           0                           
A       2                               
E   3   

That would be tab for a G-major chord picked one note at a time from low to high, since you finger a G-major 320003.