Play guitar, left thumb position

The left thumb of classical guitar and folk guitar is different.

The thumb of the classical guitar is supported in the center of the back of the neck, and it is not good to lean too high or too low. Don't bend the first joint of the thumb, and bend the other fingers naturally. Never fold the fingers that press the strings.

The thumb position of folk guitar is basically random, basically outside the fingerboard, and sometimes the thumb is needed to press the strings. There is no deliberate strict requirement on how to press it comfortably.

The thumb position needs to be adjusted according to the position chord, but the key point is that the thumb should not be too stiff, just hold the neck gently. If the thumb is too hard, it will make the jaw tense, which is not conducive to the conversion of finger position. Pressing chords mainly depends on the downward pressure and gravity of fingers, rather than the clamping force at the top of thumb, which is particularly important in high lateral pressure. Even if it is a big horizontal press, the thumb should be moderately relaxed, otherwise the lower jaw will hold the neck.