The main aim is to be comfortable and have easy access to the guitar fretboard. A music stand will also be helpful.
Use a wide guitar strap and adjust it to a comfortable length.
The right hand is used to play the strings by plucking them with a pick. A pick is a piece of plastic shaped like a triangle.
Hold the pick lightly between your thumb and first finger, as shown in the following photo.
Use the tip of the pick to play the string.
The correct position for your right arm is shown in the photos below. Notice that your forearm rests on the upper edge of the guitar, just below the elbow. Be careful not to have your elbow hanging over the face of the guitar, or your right hand too far along the fretboard. Also when you are playing single notes, support your right hand by placing the second and third fingers on the body of the guitar.
If you are playing an acoustic guitar, pick the strings over the sound hole as this makes the best sound.
If you are playing an electric guitar, pick the strings between the pick-ups.
If you are strumming a chord, do not support your right hand with your fingers on the body of the guitar but still rest your forearm on the upper edge of the guitar.
The left hand fingers numbered as such:
Your fingers should be on their tips and placed just behind the frets (not on top of them).
Be careful not to allow the thumb to hang too far over the top of the neck (Photo A), or to let it run parallel along the back of the neck (Photo B).