x = don't play string o = play open string
If the same fingering appears for more than one string, place the finger flat on the fingerboard as a 'bar', so all the strings can sound.
Examples of use
In major keys, major chords are found on the I, IV and V (1st, 4th and 5th) degrees of the scale. In A# major, that means A#, D# and F. These three chords form the basis of a huge number of popular songs.
In a minor key, a major chord is found on the III, V and VI (3rd, 5th and 6th) degrees of the scale. For example, in D# minor, there are major chords on Gb, B and A#
