We use Knowledge base software to create, manage, and publish documentation such as user manuals, help files, and online guides.
There are some complex help authoring tools, but simple-to-use Knowlegde-based software like Document360 provides more robust features with a user-friendly interface. https://document360.com/
Creating User Manuals: When you must produce detailed user manuals for products or software.
Its features include Context-Sensitive Help, and Publishing to Multiple Formats such as PDF. Bulk updating feature, versioning and rich editor make it a brilliant tool to support all types of documentation. If you want document API, API documentation is also available as an add on feature.