Patterns with thumb and index
In all previous fingerpicking guitar exercises you have played using only the thumb of your right hand, it is time to use your index finger. The two fingers will play together on different strings.
To play the next exercises you will need to pay particular attention to the your right hand. Observe your wrist that should be well up and away from the strings, do not commit the mistake of keeping it too close to the guitar.
Also observe that the thumb, having pinched, not direct to the inside of the hand against the other fingers. Having pinched it must remain always in a position external in relation to the other fingers.
In exercises 22 the index finger of right hand, indicated by "i", will play the third string open with the thumb. In sum, these two notes play on the first beat at the same time each measure.
In the exercise 23 the middle of the your left hand press on the 4th string and the ring finger on the 3rd press the frets indicated. Play with the thumb without ever lifting your fingers.
The exercise 25 summarizes the previous. It 's a little complex for a beginner but is also very musical.