Why Fingerboard Fretboard Neck Marker Dots?

What are those dots on the fingerboard and neck for? The set of TWO dots is just behind the 12th fret, and marks the 12th fret, which is positioned at the exact half-way point of the string scale length, which is the functional, vibrating length of the string as measured between the nut and the bridge saddle. When a string is shortened by exactly half, or lengthened by exactly double, you get the exact same note, just one OCTAVE higher or lower, respectively. The root word of OCTAVE is OCT, which means 8, as in octopus, octagon, (October used to be the 8th month)... There are only 8 notes actually used in a Western natural scale, from the root note to the octave note, which is why there are 12 frets, or 12 half-steps, between any root and octave. (Technically 7 notes are each used once, and 1 note used twice, at the root and octave)(root-A-BCDEFG-A-octave)

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Learning Guitar, Starting At The 12th Fret, Or Octave

https://rumble.com/vc0mwb-learning-guitar-starting-at-the-12th-fret-or-octave.html