Most of it is really just common sense. You don't bang your racket on the table. You hope not to catch the rubber on the edge of the table. Cleaning your rubbers during play is useful for keeping the topsheet grippy and helping you spin the ball. Cleaning the rubbers is easy. You can use water and a sponge. You can use a small amount of water on your hand. You don't want to get the wood wet though. I seal my blades. It makes taking the rubbers off easier and protects the wood. Cleaning your rubbers after you are done playing is a good idea as well. So that when you put it away, the topsheets are clean.
A racket case is very useful to hold your racket when you are not using it. Protective sheets for the topsheet: I know a lot of people who do not use them. I find them helpful. I like them. I feel like the biggest thing they do is, when you put your racket in your racket case, or pull it out, they protect the topsheet, particularly the edges of the topsheet.
But, in the end, use your common sense. That will help you care for your racket.