17: Guitar chord progression: G-key I-IV

Step 1. Press the Gmaj finger positions.

Step 2. Remove 1st finger and press 2nd string 1 fret with 1st finger.

Step 3. Remove the 2nd finger and the 4th finger.

Step 4. Push the 2nd finger 4th string 2 fret, 3rd finger the 5th string 3 fret. (Cmaj)