To start learning 許冠傑 - 天才與白痴 chords, build your understanding on these basic chords - A, Bm, F#m, Bm, F#m and A in sequence. I suggest starting at a calm pace of 63 BPM, and as you gain confidence, approach the song's BPM of 126. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: D Major.