Generally, you want to salt ss early in the process as tasting is possible. Allowing it to cook into the food makes it more effective, and you'll usually end up using less overall.
Day before? :)
IDK though!
I've fooded after salt and before food in the past
After since I always season to taste.
Warmer food is usually more aromatic and because of that, the flavors are much more defined.
Salting colder food is likely to result in over-salting, if done to taste.
After, I got to gauge how much salt is needed as I eat.
microwaves are for reheating food, not cooking it
salting should happen during cooking