To play the note G, pick the open 3rd string (no fingers placed behind the frets).
An open string note is indicated by a white letter on a black dot placed above the nut.
To play the note A, place the second finger of your left hand just behind the second fret of the 3rd string.
A fretted note is indicated by a white letter on a black dot.
You have already learned quarter note strums. Whether you strum or pick makes no difference to the timing. Remember that here are four quarter Count: 1 notes in one bar of* time.
The following example contains the notes G and A on the 3rd string played in quarter notes. Notice that there are four quarter notes in each bar. Play the example slowly and evenly, counting out loud as you play. It is also a good idea to practice naming the notes out loud as you play.