The craft of moving a boat under sail and living aboard one: the knots that come undone when you need them to, sail trim by one variable instead of eight names, the words that get confused, and the paperwork — logbooks, certificates — and the budgets that people get wrong in the same handful of ways.
A bowline, a cleat hitch, a round turn and two half hitches, a clove hitch, a rolling hitch and a figure-eight cover almost everything. For anchoring add the anchor bend. The test of a knot is not whether it holds — they all hold — but whether you can undo it in the dark after twelve hours under load.
What are the points of sail?
The names for the boat's angle to the wind: in irons (head to wind, no drive), close-hauled, close reach, beam reach, broad reach and running. They are one variable with six labels — the angle between the boat and the wind — and the sails are trimmed in as the boat turns towards the wind and eased as it turns away.
What is the difference between a ship's log and a sailing logbook?
The ship's log belongs to the boat and records what happened aboard — positions, weather, engine hours, incidents. A sailing logbook (RYA, ASA) belongs to you and records your own sea time towards a certificate. One is a legal and maintenance record; the other is a CV. Most people need both and keep neither properly.