Broad question... Learn the scale(s) not to know it or play it, but to know the flavor they evoke. So when you feel like using that spice or flavor, you can drop it in, like a dash of spice. Sure, if you play blues, you might not ever feel like adding a maj7 in a minor run but, what if you feel like adding that eastern, Jimmy Page style flavor one night? Boom! You could go on and on with each note. 11 other notes other than the root to play with, find out what each do, I guess. A minor 6th sounds different than a maj6, that other note you "shuffle" with. Everything you play is relative to what the bass player is doing so... You might be shredding in A minor but if the bass is chugging in C, all we hear is some C ionian noodling! Just a few thoughts I guess! Play on either way! PS; some dudes are awesome and don't have clue of names or shapes, so its all good!