However, here are some ways to express similar ideas in French, depending on the context:
Formal:
* Je sais beaucoup de choses. (I know a lot of things.)
* Je suis très bien informé(e). (I am very well-informed.)
* J'ai une vaste culture générale. (I have a broad general knowledge.)
Informal:
* Je sais tout. (I know everything. This is very informal and should be used jokingly or sarcastically.)
* Je suis un(e) puits de science! (I'm a well of knowledge! This is playful and humorous.)
Remember, it's better to be modest and avoid making absolute statements about your knowledge. Focus on what you do know and be open to learning more.