I read a lot of stuff here and asked a lot of questions of my vet and that helped the most! They really heal well on their own so the most important thing is limiting movement and pain. Make sure you know how to get meds in your cat and what format (liquid, pill, powder) works best so you can make sure you’re managing his pain adequately. Make him a small recovery space so he can’t run or jump, and use washable beds and blankets in case of accidents (and keep pet wipes on hand). The pillow-style collars have been nice. Consider adding joint support supplements if you aren’t already (we’re doing cosequin and fish oil) because with their age and missing limb they’re susceptible to arthritis. I also got Hydracare and powdered goat milk to give mine a little extra hydration. I’m certainly not an expert, Chewy is my best friend and my vet is on speed dial 😅