The two dots at the end of the staff before the double bar lines are called a repeat sign and mean that you play the exercise again from the start. This exercise is eight bars long and contains whole, half and quarter notes.
Note: The small numbers written below the staff are measure or bar numbers.
The note on the third fret of the first string is a G note.Use the third finger of your left hand to fret this note. This G note is written above the top line of the staff.