Here is few tips for beginners:
1) Don’t slump down into a low sofa:
This restricts your movement and makes playing guitar very difficult. (Especially if you’re using a large bodied dreadnought or jumbo acoustic.)
2) Don’t sit in a chair with arms:
Again, this restricts your movement and encourages you to keep your left elbow tucked in to your torso, this is terrible for guitar playing!
If you want to learn how to play acoustic guitar correctly your left arm must be completely free of obstructions.
3) Don’t perch on a high stool:
Low stools are perfect for guitar playing, but high stools are forbidden for guitar players! If you’ve tried playing at the breakfast counter you will probably have experienced this already…
Playing on a tall stool tends to make your thighs slope downwards and this means the guitar slips away from you while playing.
If you want to learn how to play acoustic guitar it’s a prerequisite that the instrument is secure.
4) So what’s the best ‘Thing To Sit On’?
Sit on anything you want, provided these two things are in place:
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Your knees should be at a 90 degree angle or angled slightly towards you.
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Both arms should be totally free from obstruction.