How to hold a Guitar?
Look carefully at the diagram add note:
(a) How the person is sitting-on the front of a chair without arm rests.
(b) How the guitar is kept vertical- not leaning back against the body.
(c) How the left-hand thumb is not sticking out hooked over the-neck-the thumb must be flat against the centre of the back of the neck.
(d) How the right-hand plays over the sound hole.
(e) How the guitar is supported on the thigh and balanced by the right arm just below the elbow.