5-12 Major Chords in D (D, G, A)
Try to think of the chords of a scale as their position. Let’s look at the D Major scale.
D, Em, F#m, G, A, Bm, C#(dim)
The D is the one (or root) chord. The G is the four chord. The Bm is the six chord. And so on. These can also be looked at in Roman numerals:
I, ii, iii, IV, V, vi, vii(dim)
The uppercase letters are Major chords, and the lowercase are minor chords.