Yes, it's safe to salt eggs before cooking them.
salt
Cooking salt is only different in that it isn't as finely ground. This doesn't come as a problem given that the bigger salt crystals will dissolve in the moisture or water before serving.
why salt is added before cooking pulse at atmospheric pressure
If you salt a steak before the cooking process it becomes dry because the sodium in salt naturally absorbs moisture.
No I wouldn't use it for cooking. Get yourself some good sea salt.
Using less salt for cooking !
A good few hours. Probably a day.
It's good to add a pinch of salt and a few drops of olive oil into the water when cooking pasta. The olive oil is especially useful, because it makes sure that the pasta doesn't stick together when boiling it, so you don't ruin it when you take it out.
It was commonly believed that adding salt to water lowers the boiling temperature of water and causes it to boil faster, however this was shown to cause such a small change that it was rendered insignificant (however covering the pot will decrease loss of heat and will cause the water to boil faster than an uncovered pot). Adding salt to water essentially only adds flavor to the pasta that you are cooking, so adding salt before or after the water is boiling really doesn't matter. What does matter is that you add the salt before you add the pasta.
How long you leave a steak covered in salt for the purpose of making it juicier before cooking depends on the thickness of the steak. A one inch thick steak should be left covered in salt for one hour before it is cooked. A 1.5 inch thick steak would be left for 1.5 hours.
gray salt can be used in some cooking recipes
poached eggs is simply cooking eggs in a liquid. be it a flavoured liquid or not, it is naturally healthier if you poach in a liquid with just a pinch of salt or none at all. as fried eggs you will need butter or oil, some salt and pepper, so compared to poaching your eggs, this is not as healthy or nutritious.