1.
Place the left index finger on the other edge of the fifth string. This is the root of the chord, B. Make sure all left fingers are on the right side to the center of the edge. This increases both tone and durability.
2.
Place the left finger on the fourth string on the fourth string. This is the fifth of the chord, F #.
3. Place the left ring finger on the fourth fret of the third string, which is the root of the chord, B.
Place the left pinky finger on the fourth fret of the second string to produce the third of the chord, D #.
5.
Drum all four notes to produce the B chord. Do not strike the outer two strings, as these notes are not part of the chord. The left index finger should, of course, turn off the first string.
Tips and warnings
Since the B chord is often found in songs written in the E, B, F # and D keys, it is usually the first non-open mode chord that most guitarists learn. When you learn to play the B chord for guitar, it is always good to play an open chord, such as A, back and forth with the B chord. This will help develop muscle memory, allowing you to easily access this chord the next time it appears in a song you are learning.
Source:danspela.com