How to practice the flexibility and independence of the left hand when introducing guitar?

Left middle finger pressing: the left middle finger pressing a certain item of the sixth string of the guitar (that is, the thickest string), the right hand thumbs hard, and has maintained the pronunciation, and then, the left index finger and ring finger, and then plucked a string (the thinnest string). Can be played into three beats, the first beat is the left middle finger press 6 strings, right hand play, this sound to maintain three beats; the second beat is the left index finger bending dial; the third beat is the left ring finger dial. We must practice slowly, that is, we must play slowly three times. Then, practice in each position.
This is when the middle finger is pressed in practice, its adjacent index finger and ring finger can be raised in the opposite direction. Be careful:
1. Pressing fingers, each joint should have a certain degree of bending, each joint should not be too straight, nor too bending, prohibit one joint of the same finger is very straight and the other joint is very curved unnatural shape. It is not required to press the strings with the fingertips, but between the belly and the fingertips. Pressed fingers should be parallel to the instrument. C1 G*A) I*k’x0 K5 n.
2. The fingertips of the left hand plucking the strings require that the fingertips (nails) be perpendicular to the fingerboard and strings of the piano. The difficulty is precisely here. The major joints of the left hand plucking the strings are almost negative bending (i.e. bending towards the back of the hand), while the major joints of the left hand pressing the fingers are positive bending (i.e. bending towards the center of the hand). Neighboring finger nerves exert complete reverse force to separate the nerves.
(2) Pressing the ring finger of the left hand: the same as the above, except that the upper middle finger is replaced by the ring finger, while the index finger is replaced by the middle finger and the ring finger is replaced by the pinky finger. The requirements are exactly the same. Obviously, this difficulty has increased, and many people will feel the great involvement of adjacent fingers. When a finger of the left hand plucks a string at the beginning of the exercise, the pressing finger can use a little thrust to offset the drag.
(3) Pressing the left little finger: the same as the above, except that there is only one ring finger adjacent to the little finger, and generally the little finger is shorter, so it is not necessary to press the sixth string, but the fifth string, and then the ring finger to move a string. The requirements are the same as those above. It is very difficult for the middle or small joints of the little finger to maintain the corresponding radian, so we should pay more attention to it.