I've found some questions and those two badges "Epic" and "Legendary" regarding the "daily reputation cap". What is it and how can I hit it?
The maximum amount of reputation you can earn in one day from upvotes and approved suggested edits is 200. Any reputation you receive beyond that no longer awards any points.
You can still earn rep by winning a bounty, accepting an answer, or having one of your answers accepted, and downvotes will still count against you.