Note Bb

Bb
A string, 1st fret
15EADG

Bb: index finger on the A string, 1st fret

The fifth F (pearl dot with the 5): D string, 3rd fret – one string higher, two frets further. Root and fifth in turn: that’s the simplest bass line.

Bb all over the neck

EADG1234567891011126831

E string, 6th fret · A string, 1st fret · D string, 8th fret · G string, 3rd fret

Other notes

Bb as the root note