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.

Is this serious? Err on the side of caution, you can always add salt later, but you can’t unsalt a dish.

Taste it then add more if they aren’t salty enough. Better to start out with too little salt than too much

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.