# Learn

The rules, the words of the game and the history of the rulebooks, in one place.

## Rules

The current rules and how to learn them.

- [One-wall rules](https://handball.theperfectship.com/rules/one-wall.md): The current USHA one-wall rulebook, rule by rule.
- [Four-wall rules](https://handball.theperfectship.com/rules/four-wall.md): The current USHA four-wall (and three-wall) rulebook, rule by rule.
- [Referee training](https://handball.theperfectship.com/referee.md): Practice questions by topic, each with the answer and the rule behind it.
- [Player guide](https://handball.theperfectship.com/guide.md): How to play each court well, from what the bots have learned.

## Terms and graph

The words of the game and how they connect.

- [Terms](https://handball.theperfectship.com/terms.md): The glossary: every actor, action, place and thing, with rule citations.
- [Graph](https://handball.theperfectship.com/graph.md): The terms and rules as a map you can explore.
- [Find](https://handball.theperfectship.com/find.md): Search the terms, rules, guide and referee questions.
- [Balls](https://handball.theperfectship.com/balls.md): Every ball specification found, current and historical: size, weight, bounce by surface, how balls are made.
- [Compare codes](https://handball.theperfectship.com/compare.md): The handball codes side by side: one-wall, three-wall, four-wall and 60x30.

## Rulebooks

Every edition, current and historical.

- [Browse the rulebooks](https://handball.theperfectship.com/browse.md): The current rulebooks with their dates, then the historical ones from 1873.
- [Family tree](https://handball.theperfectship.com/rulebooks.md): How the rulebooks descend from one another, edition by edition.
- [Rule changes by year](https://handball.theperfectship.com/rule-changes.md): A heat map of which concepts changed in which year, by code, with the same numbers in a table.
- [Rule numbers over time](https://handball.theperfectship.com/rulebooks/parameters.md): Court size, ball, points and short-serve limits across the rulebooks, as charts with data tables.
- [Clause history](https://handball.theperfectship.com/rulebooks/clause-history.md): One rule at a time: its wording through every rulebook, with the changes marked and the interpretations attached.

## History

Where the game and its rules came from, and how we know.

- [History](https://handball.theperfectship.com/history.md): Where to start: how the history is organized and how to read it.
- [Timeline](https://handball.theperfectship.com/history/timeline.md): Every dated moment on one timeline, from a few highlights to everything.
- [The Handball Record](https://handball.theperfectship.com/history/record.md): A written history of the game in chapters, with the sources named.
- [Championships](https://handball.theperfectship.com/history/championships.md): The championship series and who won them, as far as the records go.
- [People](https://handball.theperfectship.com/history/people.md): Players, officials and writers, each with the sources that name them.
- [Explore](https://handball.theperfectship.com/history/explore.md): Filter the whole history by code, era, place and kind of record.
- [Coverage map](https://handball.theperfectship.com/history/coverage.md): Which years of which codes have a rulebook on record, and where the gaps are.
- [Governance timeline](https://handball.theperfectship.com/history/governance.md): Which bodies adopted the rulebooks, at which meetings and under which chairs.
- [Open questions](https://handball.theperfectship.com/history/open-questions.md): What we think happened but cannot yet prove.
- [Sources](https://handball.theperfectship.com/history/sources.md): The books, rulebooks and records this history rests on.

## Directory

Handball links from around the web.

- [Directory](https://handball.theperfectship.com/learn/directory.md): Handball on the web: organizations, courts and more, each with a short description and a link that opens in a new tab.

## About

Where things come from, and the rest of the site.

- [Credits](https://handball.theperfectship.com/credits.md): The USHA, and the library or archive each rulebook was read from.
- [Play links](https://handball.theperfectship.com/play.md): Links straight into the game: watch a match, referee training, a rule display.