Is using screen protector the remedial from getting damage?

There are many things to consider when saying you want to protect your phone from damages and screen protector is just one of the many ways you can protect your phone. Basically it will protect your screen only, not the whole phone itself, but yeah, I can say it is helpful enough if you don't want some scratches on your screen.

It depends on how much you are willing to pay for it.

It depends on how much you are willing to spend really. The good ones, which can do what you need do cost more after all.

You can sellect screen protecting film that is high strength, some scree even can protect your eye.

Water damage and other damage can avoid if you use a good quality screen protector fitted on your phone finely.