5 - [Prerequisites](developer-guide/prerequisites.md): Prerequisites to contributing.
6 - [Rules](developer-guide/rules.md): Working on the built-in rules.
10 - [Plugins](developer-guide/plugins.md): Writing your own plugins.
11 - [Processors](developer-guide/processors.md): Writing your own processors.
12 - [Formatters](developer-guide/formatters.md): Writing your own formatters.
13 - [Rule testers](developer-guide/rule-testers.md): Using and writing rule testers.
17 - [Releases](developer-guide/releases.md): Performing releases.
18 - [Pull requests](developer-guide/pull-requests.md): Reviewing pull requests.
19 - [Issues](developer-guide/issues.md): Managing issues.