Here is an overview of the Major scale in the key of C, using the 3 notes per string system.
It can be useful to think about what fingers to use to limit the amount of positions switches per position. Mostly the trick is to start the lower strings with 1 2 4 if there is a whole step between the first 3 notes.
Practicing Scales and finding useful exercises
If you want to learn scales then you need to practice them in the right way. These posts will help you evaluate and improve how you work on scales in your practice routine
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