I have learnt some scales here on synner. But I do not know how to use them. I know how to form the major scale but I see people playing scales on different positions and sometimes they play it in a 3 notes per string kinda way and sometimes others. So what's the use of scales and how do you practice them. Which way should you play scales? Like the three notes per string way or other? Is there only one scale used in songs or multiple? How do they figure out which scales will sound good and which ones will not sound good together. Also, how do they figure out over which chords to play a specific scale? Thanks guys