Oasis style chords - Part 1 Introduction
G, C and D are the most common chords to crop up in pop songs, period. Keeping the 3rd finger down using the Oasis or Ed Sheeran technique prevents gaps between chords & helps these chords sound even better together.
Oasis style chords - Part 2 All Chords
All of these chords go together well in any order, they just sound ‘right’. This is the idea of being in a key. In this case this is the key of G.