There's no such thing as a set sequence. It's entirely up to you and your taste in music. Regardless of the order in which you learn scales (I'll provide an example later), don't just check boxes when you're learning them. The scales must be carefully listened to. What emotions does the music evoke in you? What happens when you isolate certain note combinations that you feel are "out"?
Definitions like this one help me understand what I mean when I use the term "scale." This way, you're not just doing a "up-down" exercise in a straight lined differently.
Anyway, let's get started with the basics.
To begin, I'm going to assume that you enjoy a wide range of "western" music and that, as your career progresses, you'll look to explore jazz and other more experimental genres.
The major key scale is as follows:
The major scale serves as the foundation for a great deal of music, and it's a great place to start when learning about music theory.
The major scale, which is also known as the "Ionian mode," has intervals of one, two, three, four, five, and six.
While playing the C major scale, label each note with a number, so that C is 1, D is 2, E is 3, etc...
Play the C major scale from C to C. Now, if we try the same thing in G Major, G will become 1, A will become 2, B will become 3, etc.
As a result, we have a way to connect the notes to the root of the scale.
To create other scales, we can apply sharps (#) and flats (b) to these intervals, raising the note's pitch by one step/fret/semitone and lowering it by the same amount by applying sharps. Take, for example:
The Scale of the Minor Key: