A single three-finger pinch of diamond brand kosher is my go-to. In general, using kosher salt is much easier, as you can physically feel how much salt you are applying.
Do you mean when cooking them or eating them? When cooking them, I put enough Lawry's Seasoned Salt to be visible, but not so much that the egg whites are all orange
Honestly, it's probably a matter of practice, try turning out several batches with varying amounts and see how you like them.
For salting french fries and similar foods, I use a salt shaker filled with regular table salt. When I need to see more clearly how much salt I added (including for eggs) I use a salt shaker filled with kosher salt. The larger kosher salt grains make it much easier for me to see how much I added. I hope that this is helpful.
seriously i think it boils down to just keep practicing. for me i learned seasoning by using kosher salt - after a while i think you build muscle memory on how much you use. only advice i can offer in addition to ask the great ideas here is to keep cooking 😊