Can you help me understand Modes from the aspect of chord changes?

1. Do chords change with modes?
2. What modes over what chords?
3. How do you understand modes?

Do chords change with modes?

The chords available to you in a given key are the same no matter what mode you choose. This is because you're still constructing the chords from the same set of 7 notes.

What modes over what chords?

Modes are made for soloing over chords. Each mode is able to play over a specific set of chords. If the chord is dominant, like a G7 or G9, you'd want to play the Mixolydian mode. If it is a minor chord, you can play the dorian, phrygian, or aeolian mode.

How do you understand modes?

The best way to understand modes.

DEFGABCD = 2nd mode: Dorian (start from 2nd note) EFGABCDE = 3rd mode: Phrygian (start from 3rd note) FGABCDEF = 4th mode: Lydian (start from 4th note) GABCDEFG = 5th mode: Mixolydian (start from 5th note)