Practice changing between the C and G7 chords. As both these chords contain the same G note, changing between them is quite easy because the thumb stays in the same position. It is important to always use the correct fingering when playing notes and chords.
This is a whole rest. It indicates one bar of silence. A whole rest in * time is four beats of silence.
Chord symbols are placed above the staff. There are two chords in bar 3. Each chord in this bar receives two beats.