Do you sit, stand, slouch or even lie down when you play? Your position affects that of your hands, so it's absolutely fundamental to improving your playing.
#1: Sitting posture
Your feet should be shoulder-width apart, pointing forward. Your shoulders should be back and your back straight, resting against the back of your seat.
Angle of guitar
Your guitar’s body should sit against your ribcage, with the underside of your forearm resting on the guitar. Depending on its shape, your guitar’s body should reach your belly button.
Guitars are heavy, so make sure you keep your back straight and avoid the temptation to lean over towards your fretting hand. Bad habits ingrained early are difficult to undo later on.
A low-slung guitar looks cool, but all your seated hand positions change drastically and you’ll have to compensate. Set your strap so the guitar’s position doesn’t change when you stand.
Aim to play notes with the tip of your pick. This will help you play accurately and will stop your pick snagging on the strings.
Your picking and strumming movement should come mostly from the wrist.
It should feel loose and move freely. Your forearm will move a little, but make sure it isn’t doing all the work.
The pad of your thumb should be upright around the middle of the neck.
Everyone’s hand is different, so there are no hard and fast rules, but avoid pushing with the base of your thumb, as this will limit your mobility.
Thumb for bends
You’ll probably need to move your thumb. Many players hook their thumb over the top of the neck to give them extra leverage when performing string bends.
Place your fingers close to the frets without being directly on top of them. This will eliminate fret buzz and help your playing sound clean and accurate.
Playing more than one note at a time can result in fingers on lower-sounding strings muting higher notes. If you can’t play all the notes with your fingertips, adjust your thumb position.