TextQuest is well documented, the manuals are available in English and German, as PDF-files.
The manuals were developed over the last 20 years. There is a tutorial, many examples, an index, and a bibliography. If you detect errors, or do not understand some parts, please give us a hint so that we can improve the manual.
The manuals are included in the test version as a PDF-file and are stored in the installation directory.