Proper observance of etiquette is as much a part of your training as is learning techniques. Standards of etiquette may vary somewhat from one dojo or organization to another, but the following guidelines are nearly universal:
When entering or leaving the dojo, it is proper to bow in the direction of O-sensei's picture, the kamiza, or the front of the dojo. You should also bow when entering or leaving the mat.
No shoes on the mat.
Be on time for class. Students should be lined up and seated in seiza approximately 3-5 minutes before the official start of class.
If you should have to leave the mat or dojo for any reason during class, approach the instructor and ask permission.
Avoid sitting on the mat with your back to the picture of O-sensei. Also, do not lean against the walls or sit with your legs stretched out. (Either sit in seiza or cross-legged.)
Remove watches, rings and other jewelry before practice as they may catch your partner's hair, skin, or clothing and cause injury to oneself or one's partner.
Do not bring food, gum, or beverages onto the mat. It is also considered disrespectful in traditional dojo to bring open food or beverages into the dojo.
Please keep your fingernails and toenails clean and cut short.
If you are having trouble with a technique, do not shout across the room to the instructor for help. First, try to figure the technique out by watching others. Effective observation is a skill you should strive to develop as well as any other in your training. If you still have trouble, approach the instructor at a convenient moment and ask for help.
Keep your training uniform clean, in good shape.
During class, if the instructor is assisting a group in your vicinity, it is frequently considered appropriate to suspend your own training so that the instructor has adequate room to demonstrate.