Most guides hand you a list of terms. This one gives you a path. Start at the first step, and by the last one you will be watching a bout the way the judges watch it.
Start here
How a match is wonTwo rules end almost every bout. Everything else is detail.
Sumo is easy to enjoy and hard to follow. The rules are simple, but nothing is explained to you: not the ranks, not the ceremony, not the word the announcer says the moment a bout ends.
This site is written from Japan, for people watching from outside it. Every diagram here is drawn from scratch, and every Japanese term is given in kanji, in romaji, and in plain English — so you can recognise it when you hear it.