Notes

C>D>E>F>A>B Scales are used to make chords from the notes on one scale, scale is made of 8 notes, do re mi fa so la ti do with major minor and natural variations ex:do>di

1.SCALES will lead to understanding; the ability to know and recall relationships between notes; this leads towards understanding the relationship between chords and how this sets an emotional mood; this leads towards understanding good composition and song writing; this leads towards good technique and more interesting rhythm work; this leads towards a roadmap for soloing and knowing various melodies to play over the right chords at the right time; this leads to complete mastery of the guitar.

LEARNING SCALES can do this for you. It's invaluable and will open up the guitar for you

I'd also add that practicing scales allows you to concentrate on learning the physical motions of going from note to note (this is why interval practice is useful as well). As with any other physical action, more practice allows you to spend less cognitive resource on "let's see, C to D is that, and D to G is that, and...", allowing you to think, "oh, C-D-G, right", with the notes occurring as fast as you can think them - and as you practice further, without even the subvocalizations of note names: the note becomes the action without your thinking about taking the action at all.

This will greatly enhance your ability to sight-read and improvise, and to concentrate on other aspects of your performance - e.g., tone, dynamics, and expression - because you will have the cognitive resources to do so.

remember "fat cats go down alleys eating birds", and "beadg"

There are so many scales that exist in music that it is critical for you to get organized about which of them are most important for you to learn and practice. To do that, make a list of all scales that are used most often in your style of music and do NOT move on to learn lots of other obscure and unusual scales until you have a very firm command of the essential scales used in your style of guitar playing.

you must make time in your practicing to learn to play every scale you want to master all over the guitar. Fact is, you can write much more music (much more expressively) with only a single scale that you know on the guitar inside and out than you can with dozens of scales that you can only play in one area of the guitar.

it is important to spend some time observing how the guitar players you admire actually use scales in the music you listen to. Depending on your level of skill with ear training, you can either do this by using tab of solos (that you are sure is accurate) or (ideally) transcribing the solos yourself by ear and analyzing your own transcriptions.