Car rust repair

My car needs rust repair so bad.I know that rust spreads super fast and that just means I need to get it taken care of even faster. What kind of things can I do to slow down the process? I read that I can’t get rust out of the metal but I can slow it down.
I’m looking for some of these methods. I have heard rumors that wd40 spray can help cut rust down. Not sure if that’s true but I’m looking for methods to slow the rust on my car.
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