How to play the acoustic guitar

First of all you must know play the guitar in the corect position, this is whyI´m going to explain now. Separate your back from the chair , so do not sit in the end of the chair. Hold the waist of the guitar in your right leg ( left if you are lefty) and put your right forearm on the border of the box, with you back straight but relaxed. Then your left arm, you must place your thumb behind the mast, leaving the others fingers free to pull the strings. I use to put something under my right leg to raise a little the guitar. This position is sited of course and the rope should not interfere while playing.