The G#m7♭5 chord (half-diminished): notes G# B D F#, degrees 1 – ♭3 – ♭5 – ♭7. Guitar shapes: 454474, 4544xx, xx6777, x-11-9-11-9-10.
A chord is the root plus degrees above it, most often stacked in thirds. Major and minor differ only in the lower third: a major third (M3) sounds bright, a minor third (m3) sounds sad. Pick a chord and a root to see its degrees and intervals, and its shapes.
m — minor, M — major, P — perfect, A — augmented interval; the number is the degree count. m3 is 3 semitones, M3 is 4, P5 is 7
G# G#m G#5 G#7 G#m7 G#maj7 G#sus2 G#sus4 G#add9 G#6 G#m6 G#9 G#dim G#dim7 G#m7♭5 G#aug