Here are the main sources of help with QuPath questions:
This documentation, including FAQs
The Command List & its built-in help
forum.image.sc - main user forum, shared with other open source projects
Issues on GitHub - bug reports, not general questions
YouTube channel - includes video tutorials and webinars
Twitter - most things will be announced here first
There’s also a fantastic forum post introducing QuPath from a user’s perspective here. Please note this post refers to version 0.2.0 and there has been a few updates since then!
If your needs for instruction are more modest, it’s always worthwhile to try hovering your mouse over nearby buttons or input controls - there’s a good chance that an explanation will pop up to explain what the control does.
Help for pre 0.4.0 versions
Documentation for previous versions can be accessed within Read The Docs via the versioning in the lower left corner of any page.
Help for version 0.1.2
The following resources relate to QuPath v0.1.2 (from December 2018). They are no longer actively maintained, and some information may not apply to v0.2.0.