A sus chord swaps the 3rd for its neighbour: the 2nd (sus2) or the 4th (sus4). Without the 3rd it's neither major nor minor, just open and waiting, and it usually goes back to the plain chord. An add9 keeps the 3rd and adds the 2nd an octave up: Cadd9 is the shimmering C of countless acoustic songs.
Most of these are one finger away from the open chord you know, which makes them easy to drop into songs: D Dsus4 D, A Asus2 A, G Cadd9.
Dsus2
Dsus4
Asus2
Cadd9
Esus4
Try this
Play D Dsus4 D Dsus2 D with the island strum, moving only one finger. Then G Cadd9 G Cadd9.
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