I would like to ask what this chord on the guitar tab means.

A chord is a group of sounds with a certain interval relationship. When three or more tones are combined vertically according to the superposition relationship of thirds or non-thirds, they become chords.

Speaking of chords, there is a lot to talk about. It is recommended to read a basic book on music theory.

Let’s talk about the chords in guitar tabs.

The six-line notation for guitar is actually very simple, as long as you match the grid and lines to the strings of the guitar.

For example, the C chord in the picture above,

from left to right, corresponds to the 654321 strings of the guitar (the thickest is 6, the thinnest is 1)

From The top and bottom correspond to the grid 123 frets on the guitar fretboard. (If there is a number on the left side of the chord, it means that the chord starts from the fret of this number. For example, there is a BM7 chord in your diagram, which is a big horizontal press. There is a 2 on the left side of the chord diagram, so it starts from the 2nd fret. Counting from the beginning of the fret, the index finger presses the 6th string of the 2nd string, the middle finger presses the 3rd fret of the 2nd string, and the ring finger presses the 4th fret of the 4th string)

The chord pressing method is as shown in the C chord in the picture above, and the ring finger. Press the 5th string on the 3rd fret, the middle finger on the 4th string on the 2nd fret, and the index finger on the 2nd string on the 1st fret. You can see how to press the fretboard on the right side of the picture above.

The 6-line notation below the chord is even easier.

The 6 wires, from top to bottom, correspond to the 123456 strings of the guitar, (the thickest 6, the thinnest 1)

Then, when you press the chord, On whichever line you play the corresponding guitar string.

As shown above: press the C chord and play the 5th string, the 4th string, the 2nd string, and the 1st string.

The vertical line under the root string.

Also, the numbers appearing on the six-line spectrum below represent the grade. For example:

The picture above shows the 3rd and 5th frets of the 5th string, the 2nd, 3rd and 5th frets of the 4th string, the 2457th fret of the 3rd string, and the 568th fret of the 2nd string.