What does nothing ventured nothing gained mean?

Answer 1

It's an old proverb that means if you don't put effort into something, you won't gain anything.

A more modern example is 'You can't win if you don't play'
Its means if you spend your time not doing anything, then you won't gain any rewards or achieve any goals.

Answer 2

It means that if you don't try, you can't get anywhere.