A chord progression is the order chords are played in, one after the other. This order is important because when you change the order and context of the chords in a progression, you change the overall feel of the music.

The one chord in a key acts as the "home base." For example, in the key of C, the C major chord is home. Each chord in a key has a relationship to the home chord, and they all work together to create a journey to resolution back to home.

Chords tend to move in a certain way based on their functions. Chords from outside of the key function as unstable, and so they usually resolve to a more stable chord like the one chord (C). They can also be followed by another unstable chord like the four chord (F) or a dominant seventh (G7) to increase the instability and delay resolution.

In the video, I discuss what you should know about chord progressions and how they work. I also demonstrate how changing the chords (or using a different progression) under a repeated melody helps create a different feel in the music.

https://youtu.be/0fqKId2ZcZE