Basis

1. Find the key
2. Find the chords
3. Find the melody
4. Add the root note of the chord to the melody at the first bit
5. Add other notes out of the chord (try different rhythm, e.g. t1213121). Note the notes that added can’t be higher than the melody

Advance

• Change to another barre chords (把位)
• Use different rhythm or strumming
• Try 7th or 9th
• Try sus2 or sus4