Watch the Grandpa Barre online guitar lesson by Brad Carlton from Chord Studies: Beginner Chords Vol. 1
In this final progression, we're playing four chords: C, F, A Minor, and G. The F, A Minor, and G chords all utilize a "grand barre", meaning you'll bar all six strings with your index finger. Look for pivot and guide fingers on this one. Between the C and the F, your third finger is a pivot. From the F to the A Minor to the G, your barre and your third and fourth fingers will be guide fingers. As you get more comfortable, try gently lifting those guide fingers as you switch chords to eliminate any squeak on the strings.