To learn 后海大鲨鱼 - 心要野 chords, your practice should emphasize these chord progressions: G, Am, F, C, G and F. I suggest starting at a calm pace of 45 BPM, and as you gain confidence, approach the song's BPM of 91. For a balanced pitch, adjust the capo with respect to your voice and the song's key: C Major.