Watch the Day 17 online guitar lesson by Ravi from Learn Guitar in 21 Days

This four chord progression is quite common in popular music, so you'll hear a number of songs that lend themselves to this sequence.

Also, several of these chords have "anchor" fingers to help you make the transition. So, take advantage of that by fingering the chords in the manner that I have suggested. Again, let's keep the strumming simple, as that will take shape on its own once the chord changes are down with your fingering hand.