First of all, due to the shape of sushi itself, there are many rules on how to put sushi in your mouth.
Don't grab sushi hard, but handle it gently so that it won't spread out. If you want to use chopsticks to clamp, you should pay attention to the clamp. If you clamp sideways, it will easily come apart.
Serious sushi restaurants have soy sauce and ginger slices, and there are many rules about how to use them.
Soy sauce is not dipped for you, but brushed on sushi. Never dip sushi in soy sauce, it will be embarrassing. Just brush soy sauce on the surface of sushi, don't touch rice, it will destroy the overall taste of sushi.
Ginger slices cannot be eaten with sushi. Their function is to "relieve boredom" and avoid the numbness of taste caused by eating too much sushi.
The most important thing to eat sushi is to finish it in one bite. If something is not big, there is no need to taste it in one bite. This will only make others think that you are a "terrapin", and the sushi will be scattered and ugly.
Specialized sushi restaurants have a very unique tradition, that is, the "ten-second principle".
The new sushi is in front of you. If you don't start it for more than ten seconds, then you have no right to enjoy it. No matter whether this principle is strict or not, don't try it casually.
There is another rule for eating sushi, which you should have noticed in the TV series. Many Japanese dishes are very common.
Sushi should be tasted from light to heavy and enjoy the feeling of gradual change. Just eat other sushi first, and sweet sushi is best eaten last.