Don’t try to sail or handle a boat until you know how to swim.
Don’t set out on a sail without oars, compass, water, anchor and at least one life-preserver on board.
Don’t jump, run, wrestle or skylark in a sailboat.
Don’t allow anyone to sit upon a rope or line which may be used at any moment.
Don’t permit passengers to sit or stand on the bow or bowsprit unless for the express purpose of keeping a lookout.
Don’t tie or make the mainsheet fast. Hold it in your hand with a single turn about a cleat, so it can be released instantly.
Don’t try to show off by carrying all sail in a blow or in squalls. Reef before it’s too late. It’s easier to shake out a reef than to put one in.
Don’t sail across or close to the wake of steamers to “get” their waves. It may result in the boat capsizing and only shows you are a landlubber and a fool.
Don’t start out in the face of a storm, gale or squall. Wait until you are sure of what is going to happen and then reef close if you must go forth in a blow.
Don’t forget that you cannot judge the force of the wind or the size of waves from the shore.