The cycle of seven shapes. Sounds super fancy but those are all tiny. I literally learned that pattern for the major modes in all positions on the neck in a day and was fluent less than a week later. When you put those small pieces together you make one of the two or three patterns that I mentioned. for example take the three note groups tone tone (cross) tone tone (cross) semitone tone tone (cross) tone semitone if you want to play a two octave major scale starting on the first finger on either of the two lower strings. That pattern is just swapped around if you want to start on the second finger. So you just play tone (cross) semitone tone (cross) to play the first octave to the seventh degree and then either slide up a fret and do the first pattern I mentioned or continue across.

And if you play those patterns then all the modes of the major scale just kind of fall out of that.

Not boasting - it’s just not a complicated thing at all.