Barre chord
fret 1, A shapex13331
B♭ is the B♭ major chord. Its notes are B♭, D and F. It is the same chord as A♯. A clear, stable sound. A natural home chord in a major key.
x13331
688766
Numbers show frets from the low E string to the high e string; x means don't play that string.
B♭ is the I chord in B♭ major, the IV chord in F major and the V chord in E♭ major. That makes it a natural fit in songs written in those keys.
Every B♭, D and F on the first 12 frets. The filled dots are the root, B♭. Build your own shape from any nearby group.
Other B♭ chords
Other major chords