Here you can find community made guides, tutorials & videos about how to setup/use HACS.
NB!: Most of what you find here is static, and may not be up to date.
Danish HACS Setup Guide
by Daniel Bahl
You can find the complete danish walkthrough guide at Robotnet.dk
Home Assistant Themes and Plugins with HACS!
German HACS Setup incl. first integration
How to Setup & use Home Assistant Community Store (HACS) | TUTORIAL