How to Draw Trisect a Line Segment? Using an Unmarked Ruler and Compass, Step-by-Step, Method 1

A method of trisecting line segments using only a compass and an unscaled ruler.
How to draw? Method 1, Step-by-Step,super easy!
1. Draw any line segment AB. 00:09
2. Use point A as the center and AB as the radius to draw an arc. 00:38
3. Use point B as the center and AB as the radius to draw another arc. 00:57
4. Identify the intersection points C and D. 01:07
5. Draw a line through points A and C, intersecting arc A to obtain point E. 01:19
6. Draw a line through points B and E. 01:40
7. Draw a line through points A and D. 02:04
8. Identify the intersection point F. 02:24
9. Draw a line through points C and F, intersecting AB to obtain point G. 02:34
10. Use G as the center, AG as the radius, and draw arcs intersecting GB to obtain point H. 02:59
11. Confirm that AG = GH = HB. 03:35
Thanks for watching!

[@MohamedAlDemerdash]

Many thanks for your efforts... Can you please explain why G and H are the trisecting points? In other words what is the theoretical knowledge behind it?