C#
A string, 4th fret
C#: little finger on the A string, 4th fret
The fifth Ab (pearl dot with the 5): D string, 6th fret – one string higher, two frets further. Root and fifth in turn: that’s the simplest bass line.
Fret the note and tap “Check me!”.
C# all over the neck
E string, 9th fret · A string, 4th fret · D string, 11th fret · G string, 6th fret