Use your thumb to "point" (touch) a section of your index finger, middle finger, ring finger, pinky...now move up a section of the finger.

Tada you learned it.

The other hand goes 1 when you maxed out your finger sections, then 2 when you do it again where one equals 12 and 2 equals 24 etc.

There's really nothing to it, no research needed...just attempt to mimic what the comment describes and you're there.