Brazilian Jiu-Jitsu is a martial art and combat sport that focuses on grappling and especially ground fighting with the goal of gaining a dominant position and using joint-locks and choke holds to force an opponent to submit or be knocked out depending on what submission method is used. The art was based on early 20th century Kodokan Judo/Kosen Judo which was itself then a recently-developed system based on multiple schools of Japanese Jujuts.
There are three rules for a good jui jitsu by Eduardo, The rules are to train hard, eat right and sleep well. The aesopian-Brazilian jui jitsu elaborate
Diet is always important but especially when you’re an athlete (and that’s what you’ve become if you’re training hard). Nutrition is well researched and there’s a wealth of information out there. I’ll leave it to you to find what’s right for your body.
He also specifies why good sleep is needed and how good or bad sleep can affect your skills in combat. So if you are already good following the rules can make you great.