This is a sixteenth note.
It lasts for one quarter of a beat.
There are four sixteenth notes in one beat.
There are 16 sixteenth notes in one bar of * time.
Two sixteenth notes.
Four sixteenth notes.
When counting 16th notes, notice the different sound for each part of the beat - one ee and ah, two ee and ah. etc (written 1 e + a, 2 e + a. etc).
Once you are comfortable counting sixteenth notes on one pitch, apply them to the minor pentatonic scale as shown here.