The following Blues progression contains a Bb note and a C7 chord. The numbers written under the tablature are left hand fingering numbers which indicate the most practical fingering to use.
Rhythm Pattern
A dot above or below a note indicates that the note is to be played staccato, which means short and separate from other notes.
To play a note staccato, lift the left hand finger off the fret as soon as the note sounds. If you are playing an open string, stop the sound with the right hand as soon as the note is played. Experiment with staccato in your own playing until you can do it naturally.