A long list of nautical words can become another document you never open. A small glossary built around real questions is easier to return to. Start with five terms from a book, a lesson or a conversation, rather than trying to collect the whole language of sailing.
Give each word a job
Use four short fields: term, plain explanation, contrasting term and example. For port, the contrast might be starboard. For knot, the contrast is a nautical mile: speed on one side, distance on the other.
Write explanations you can understand a week later. If the definition contains two more unfamiliar words, either explain those as well or choose a simpler wording. Keep the original source beside the entry so you can check whether your paraphrase has changed its meaning.
Test the difference, not just the memory
Cover the explanation and try a sentence. “The boat covered eight knots” should prompt a pause: did you mean a distance in nautical miles or a speed in knots? A useful glossary helps you catch this kind of mismatch.
Add a small sketch when direction or position matters. Label the viewpoint explicitly. Our guide to port and starboard is a starting point for that exercise; nautical miles and knots offers a numerical example.
Leave uncertainty on the page
If a term seems to change with context, record the whole sentence in your private notes and ask an instructor or consult a reliable reference. Do not turn a half-understood phrase into an instruction for someone else.
Review only the entries that appear in your next piece of reading. A glossary earns its place through use. Five distinctions you can explain clearly are a better foundation than fifty definitions copied without understanding.