A scale is a series of notes, one after another in a certain order. For example the order of the notes, Do - Re - Mi - Fa - Sol - La - Si - Do this is a scale.
The minimun notes you may have in a scale are 5 notes, is a penta scale, like all the black keys on a piano. Db, Eb, Gb, Ab, Bb
A Lot!. But you can learn a way to know how to make each and every scale. Start with one.
The Major and minor scales. The Major scale is more popular, like the C major scale, Do - Re - Mi - Fa - Sol - La - Si - Do.
The C Major scale has 8 notes: Do - Re - Mi - Fa - Sol - La - Si - Do.
The C scale has no sharps and no flats.
Note 1 - C or Do - Play it pressing the string No. 5 and the fret No. 3
Note 2 - D or Re - Play it on the string No. 4 Open, do not press any fret
Note 3 - E or Mi - Play it pressing the string No. 4 and the fret No. 2
Note 4 - F or Fa - Play it pressing the string No. 4 and the fret No. 3
Note 5 - G or Sol - Play it on the string No. 3 Open, do not press any fret
Note 6 - A or La - Play it pressing the string No. 3 and the fret No. 2
Note 7 - B or Si - Play it on the string No. 2 Open, do not press any fret
Note 8 - C or Do - Play it pressing the string No. 2 and the fret No. 1
The G Major scale has 8 notes: Sol - La - Si - Do - Re - Mi - Fa# - Sol.
By watching the video, you should be able to play it.
The D Major scale has 8 notes: Re - Mi - Fa# - Sol - La - Si - Do# - Re.
By watching the video, you should be able to play it.
The A Major scale has 8 notes: La - Si - Do# - Re - Mi - Fa# - Sol# - La.
The E Major scale has 8 notes: Mi - Fa# - Sol# - La - Si - Do# - Re# - Mi.
The F Major scale has 8 notes: Fa - Sol - La - Sib - Do - Re - Mi - Fa.
The Bb Major scale ( B flat ) has 8 notes: Sib - Do - Re - Mib - Fa - Sol - La - Sib.
The Bb Major scale has also another name, the A sharp (A#) scale.
Because the A sharp has a lot of sharps, is not very popular, and for beginners is really dificult to understand
That is why the Bb is a lot more popular. And besides, it sounds the same, so play Bb better.
So far you should know these scales
C - G - D - A - E - F - Bb
Try to play each scale now from memory, without looking at the videos.
If you can not, then practice more and memorize each scale.