As you now know, there is a difference between scales and positions. If you want to practice scales, you generally start on the root and play up to a higher root that is either one, two or as many octaves as you can manage, then back down to the original root.
Both have their merits. Scales teach us how to navigate our instruments, learn our fingerboards and hear tonality, among other things. Positions show us all the available scale tones available to us across all six strings in a vertical space 4 to 5 frets wide.
Don’t let anyone talk you out of the fact that learning positions is not useful. It is extremely useful in many ways. First things first, melody has this strange habit of not always beginning and ending on the root note of the key you happen to be playing in. The highest and lowest notes of a melody are also not always, or even usually the root note of the scale. This means that our nice sequence of do-re- mi is just a reference for where everything is, it is not music on its own. Here is a simple example, let’s say you are playing a melody or solo where you want your high note to be the second degree of the scale. By knowing the position in your first diagram that note is available to you on the high E string.
The other thing about knowing positions is it teaches you to learn where the notes to a given key is on the ENTIRE fingerboard, not just in two or three spots where you feel comfortable playing it.
Here is a similar but better diagram of the scale positions. This particular one eliminates the big stretches in some of yours which I think is better to work with initially. As the caption says, this diagram shows the intersection points where the positions share common notes. The notes you play with fingers 3&4 will be played with fingers 1&2 in the next position, shown by the boxes between the positions. These positions also happen to coincide with the chords of the CAGED system. I’ve outlined those chords on the diagram in blue for reference. FYI if you use these actual fret numbers all of these positions are the key of G major:
Knowing these positions will give you options of where and in what register you want to either play a melody of solo in. You can play any key anywhere you choose on the fingerboard. Say you have a melody where you want to play a high 5th as your top note. Position 3 is a good choice. They are also useful for learning how to move horizontally across the neck. Here is an example. Starting in position 1, play the first octave but when you get to the octave note on the D string. Instead of using finger 4, slide up and play it with finger 2. Voila, now you’re in position 2! You can find an infinite number of ways to shift from one position to another using this basic concept, just try and be as logical and smooth as possible.
The last and very important thing I want to leave you with is I believe the best way to practice and learn positions is to still think of them as relating to the key you are in. For me that means always starting and ending on the root. Start on the lowest root note, even if it is on the D string, play all the way to the top, then back down past the starting root note down to the lowest note in the position, then work your way back up to the original root note and end there. This way you always have the sound of the key you are playing in your head.