All about it!
-Getting in and out of the water
To get into to the water, step in flippers first whilst goggles and snorkel is on.
This involves bending at the waist and then kicking your legs in the air. This puts you in a vertical position which will take you under.
-Clearing snorkel and mask
After going underwater, blow the water out of your snorkel, for your mask you have to take it off and drain the water from the mask.
Basic snorkelling first aid
Basic first is to know CPR:
Check the victim for unresponsiveness. If the person is not responsive and not breathing or not breathing normally. Call 911 and return to the victim. In most locations the emergency dispatcher can assist you with CPR instructions.
If the victim is still not breathing normally, coughing or moving, begin chest compressions. Push down in the center of the chest 2 inches 30 times. Pump hard and fast at the rate of at least 100/minute, faster than once per second.
Tilt the head back and lift the chin. Pinch nose and cover the mouth with yours and blow until you see the chest rise. Give 2 breaths. Each breath should take 1 second. Continue with 30 pumps and 2 breaths until help arrives.
Also a first aid kit can provide equipment to treat minor cuts, scratches, headaches, sinus block and other and stuff that can occur while diving.