[FwL]

Learn the C major scale up and down each string. Name the notes as you play them. Practice that for a week or two. Then move one key clockwise on the circle of 5ths (G major). Practice that for a week or two.

From there, you can go one more key clockwise (D major) or go one key counterclockwise from C (F major).

As you work clockwise around the circle of 5ths, each new key adds one sharp. As you work counterclockwise, each new key adds one flat.

Done this way, you'll be learning where the note are located on the fingerboard as well as the major scale in all keys along with the key signature of each.

That's a lot of bang for the buck.

Eventually you'll want to work out the scales across the neck in positions as well.