These help pages are intentionally written to be more basic and less comprehensive than the official help pages. If you want something that goes beyond the basics of scratching the surface go read them here.
Covers downloading, installing, updating, and backing up Hydrus.
Covers importing files, one of the first things many Hydrus users do, and exporting files.
Downloading files and getting more downloaders.
Tagging and rating your files, imported or downloaded. Siblings and parents.
Searching you files. System predicates. Sort by and collections.
Duplicate filtering. Alternate groups.
Where to find it and what to do with it.