Covid Vaccine

I just got my first vaccine yesterday. I believe it is safe for people to receive it. If people do not have it, then they can get sick or die. They can have long term health effects even if they get sick and live.

I have not researched much but haven’t they tested it on many people before making it available? Also I heard my dad saying Covid variants are affecting younger people now. So it should be good that they are having the opportunity to have the vaccine now.