I recently bought my used XJ and it has some rust on it. Doesn't bother me but i'd like to know what to do to repair it (DIY). From about an inch or two width, it goes from the drivers side bottom of wheel well - to rear wheel well. Some spots of rust is thru the body even.

Noob to mechanics and Jeeps. Fast learner. On the path to taking care of it. Ideas needed.

Thanks