Here are a couple great ways to modify your main chords in the key of D. We can play a Bm7 chord instead of a regular Bm, and we can play different varieties (or “substitutions”) of a D chord, such as a Dsus2 or Dsus4, etc.

This is the next-to-last main key we need to learn. There are a couple uncomfortable chords that are often played in this key, including the A/C# and the Bm chords. But as always, with regular practice you’ll have no trouble at all with these shapes.