Navigating The Fretboard
A whole step is the distance of 2 frets on the guitar
Now let's look at a couple of examples just to be crystal clear...
This example is an ascending half step. The pitch is raised by one fret from the 8th fret to the 9th fret on the 3rd string. If you were to reverse the order, you would now have a descending half step in which the pitch is lowered by one fret from the 9th fret to the 8th fret.
This example is a descending whole step. The pitch is lowered by two frets from the 3rd fret to the 1st fret on the 1st string. If you were to reverse the order, you would now have an ascending whole step in which the pitch is raised by two frets from the 1st fret to the 3rd fret.