I crafted the power switch but i can't seem to find any use for it, i connect it to something and when i pull the switch absolutely nothing happens, this is probably just that i don't know how it works, can someone explain?

If you attach your normal power source / base to one side, and something else to the opposite that you don't need power running to all the time, you can use the switch to prevent power from going to those un-needed modules.  In this example, the construction yard still uses 2.5 power even when not in use, so flipping the switch to off keeps that power and stores it in the batteries instead:

Deconstructing the conduit cable would have the same effect.

Thank you so much, this makes so much more sense from what i was doing hahaha

This definitely confused me as well. The power grid mechanics aren't very clear or intuitive; it would be nice if the tutorial had a section on how to manage it.