Now take this advise with a grain of salt, but I learned the scales in this order:

* Major Scale
* Minor Scale
* Minor/Major Pentatonic Scale
* Blues
* Dorian

Now, my reason for this is because Major and Minor scales are building blocks of it all. Then I went to pentatonic scales. Each minor petatonic scale has a matching major pentatonic scale.

* C Major / A Minor
* D Major / B Minor
* E Major / C# Minor
Etc

Also, pentatonic is used a ton and its shapes were the easiest for me to leave. You learn the five positions and then just change where you start for what scale it is. A great thing to check out is the Scale tool on here (https://www.guitartricks.com/scalefinderpop.php) will help you see the notes in the scales.

Then after pentatonic, I went to Blues scale because it is same as pentatonic, just with a couple more notes.

Then I did Dorian, because it is same as blues with a couple more notes.

By doing this way, I built off what I have previously learned.

Now, that being said, this worked for me. Not saying it is the best way. LOL