Note
This version of the guide covers the new PHP-based rendering of Documentation with the TYPO3 Documentation theme.
If the project you are looking at has a file Documentation/guides.xml it is using the new rendering.
Otherwise, consider to migrate the Documentation or head over to the legacy version of this guide: How to document, Sphinx based.
Licenses
Old manuals that are maintained by the TYPO3 Documentation Team usually are published under the Open Publication License. We keep that until something else may be decided somewhere in the future.
New manuals should be licensed under Creative Commons BY 4.0.