Barlines are drawn across the staff, dividing the music into sections called bars or measures. A final barline signifies the end of the music.
This is the four four time signature.
The time signature is written immediately after the treble clef. The top number of the * time signature tells you that there are four beats in each measures.
The bottom number tells you that there are four quarter notes in one measure of music in * time.
You already know the note A. It is the open A (second) string. This time the note A is played in quarter notes. Alternate your bow strokes as you play.
Note: The numbers underneath the staff are counting numbers.
The note B is written on the third line of the staff. The stem for the note B can go up or down, because it is on the middle line of the staff.
Play the note B with your first finger on the A string.
On the recording this example is played pizzicato. It is a good idea to practice all examples both arco and pizzicato.