To learn ガガガSp - 友よ chords, focus on the sequence of these chords: Abm, E, Gb, B, Eb, E, Eb, Ab and Gb. I suggest starting at a calm pace of 80 BPM, and as you gain confidence, approach the song's BPM of 160. Fine-tune the capo based on your vocal range, ensuring it complements the key of Ab Minor.