Watch the Day 13 online guitar lesson by Ravi from Learn Guitar in 21 Days
Let's practice switching between C and G, as these are not the easiest ones to master but you can do it! Just take your time and keep the strums simple. Try to move all your fingers at the same time as that is ultimately the way to make the change as quick as possible.
Remember, if you can't keep up with me, just leave the chord a little early in order to arrive at the new chord on time. That will help achieve a smooth sound until you get the change down a little more quickly.