How do you recover from an injury?

How do you recover from an injury? I recently had a knee injury and want to know how long you have waited to get back into it, or some advice for injuries? :) thank you!

I am recovering right now from shoulder rotator cuff surgery. Physical therapy 2x a week with a pro. Ice after dancing 20min at a time. I take meloxicam anti inflammatory cuz its less harsh on stomach. I had knee surgery in 1995 acl reconstructive and orthoscopic to cut out the torn cartilage. I did tons of pt for that and to this day I ice it after dancing hard. I eat really healthy for my blood type and I don't eat things that will inflame athritis or joints. I try not to eat too much sugar. Advice: stay off it if it hurts because if its a minor tear it can heal. If u can't. Put weight on it or straighten it get an mri or a sports doc to check it for torn cartilage or ligament. It depends how bad your injury is! Good luck and hit me up if you have anymore ?s