The first weeks will deal with how we treat equipment.
Rule#1 - Always wear a snorkel.
This is a required accessory for scuba students and their instructors during training dives, but after that it can sometimes be a hindrance. If you are in an overhead environment, it could get snagged. If your are in a current, it could become a drag. However, it is very handy to have once you are on the surface. So, while it is not REQUIRED that you always wear a snorkel, it is highly recommended. If you reach the surface, and you are out of air, it would be handy. Or, if you surface and you want to conserve your air, it would come in handy at that time also. However, that does not mean you need to wear, it. Just carry it with you so you have it if you need it.