If you find “over/under” confusing, that’s probably because it’s misleading terminology.
You might find it more intuitive to think of this as “outside/inside”, meaning that each new loop is made by bringing the cable’s free end up to your stationary hand either outside (away from the already coiled cable) or inside (between the already coiled cable and itself) as it forms the new loop.
If you find “over/under” confusing, that’s probably because it’s misleading terminology.
You might find it more intuitive to think of this as “outside/inside”, meaning that each new loop is made by bringing the cable’s free end up to your stationary hand either outside (away from the already coiled cable) or inside (between the already coiled cable and itself) as it forms the new loop.