SEE THE FULL LESSON: acousticguitar.com/how-to-build-scales-part-i
In this lesson, you’ll learn the basics of how scales are built, what functions their notes have, how to transpose them, and how to and apply that knowledge to the guitar’s fretboard. You’ll start with the major scale, which will be your entry point for understanding scales in general. Once you’ve wrapped your mind around it, you’ll be able to learn other scales and modes with just slight alterations to what you already know.