Fixed mindset people believe that traits such as intelligence & talent in any area are fixed and cannot be fixed. You either have it or you don’t, and no amount of effort is going to change that. They think that you are born with a certain amount and that’s all you have.
With a growth mindset, people have a belief that their intelligence (or other traits) can be improved by learning, effort and persistence and they can learn new things and get better at things. They understand that effort influences success.
When you move this into area’s other than academic studies a growth mindset is a belief that no matter difficult things get, we can emerge from the experience stronger, wiser and more capable.