When I brought this car it had a couple little nicks and gouges but this one is the most worst visible one. Don't want it to get worse, any tips on how to hide or repair it?

I would take it to a local body shop to be repaired correctly ,dont think it would cost to much ,better than a home bodge job that dont match 👍

Until it gets repaired you could get some rust inhibitor on, but the body repairer / painter will be taking that back to bare metal anyway. 

Thank you @toot and @Mickvrs220 very helpful. best bets get it done properly ay for sure 🙌