Just as chord-forms can be moved to different positions to play different chords, scale-forms can be moved to different positions to play different scales. The following diagram illustrates how one scale (C major in this example) can be played in many different positions.
Each tab example is accompanied by a diagram that shows the partial scale-form used. The point is that on the guitar (unlike piano or flute or most melodic instruments), there is usually more than one fingering for any given melody or chord. Play all the examples to convince yourself that they are exactly the same notes. They differ slightly in tone quality due to the different gauges and speaking lengths of the strings, but the pitches are the same!
Look at the scale diagrams next to each other.

Here are some excellent books on the subject
The above book includes an audio CD
with both backing-tracks and
slowed-down examples of the licks.
Now, if you grasp the above, go to the scale form page.
Examples of Scale Forms! In TAB!
Modes! In the same Scale Forms!
The Blues Scale and the Major/Minor Scale
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