I’ve searched for days but can’t find absolute beginner documentation. The docs on this site seem to be more of a reference from people who know what they’re doing. I’m seeing things like cards, groups, tabs… etc in youtube tutorials but can’t really find a break down on Hass.io and its components.
Hassio is just one way to install Home Assistant. Here is their beginners guide. By the way there are very few videos in the official documentation.