allright. here's what you need to know firsthand.
Those are the 7 major scale patterns, in a 3 note per string setup. The blue dots are your roots (if you're playing C major scale, the root is C. ) this is where your scale "settles"
with those patterns you also know your Dorian, Phrygian, Lydian, Mixolydian, Minor and Locrian scales. since they're all the same patterns.
ex: C major is the same as A Minor.
C D E F G A B
A B C D E F G
A minor starts from the 6th note of the major scale. this goes for all other scales too. modes are the same intervals, except the note focus goes into a different order (your root changes). but you don't hear modes unless you have a modal backing track. (if you play A minor over a C-E-G chord progression, it'll sound like C major because that's what you're playing)
on the picture, i put the C major scale. with all the positions. if you were to play a D major scale, you'd only slide everything up two frets. or if you were to play C#, slide everything up one fret (by up i do mean towards your guitar's pickups)
last thing, fingerings. there are only 3 fingerings to know in these scales, then it's just putting them in the right order.
(1 = index, 2 = middle, 3 = ring, 4 = Pinky)
|x--xx| you finger this pattern with 1 3 4
|xx--x| this one with 1 2 4
|x--x--x| this one with 1 2 4 also.
Hope this helps. this should take you a little while to get down.
Oh! remember, alternate pick all the way through when playing those scales.