Here is a 1 octave C major scale in open position. Below is a scale diagram, it is the same as a chord diagram but on its side. So the 6th string is on the bottom. Start with the lowest note and play each note one at a time. The first note is the Root (red dot) 3rd fret on the 5th string, the next note the 2nd is the 4th string open, the 3rd is the 2nd fret of the 4th string and so on.
When learning a scale it is very important to tie it to a chord.. So play the C major chord before and after playing the scale. You can think of the chord as a summary of a scale. A major chord is the 1st, 3rd and 5th note of a scale played at the same time. So it can be thought of as a shorthand way of playing a scale.
Knowing this will be very important when you start to write music or learn how to improvise (play guitar solos).
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