A custom integration that provides a UI to manage custom elements in Home Assistant.
softwarealso known as Home Assistant Community Store
Knowledge about HACS
Updating Home Assistant safely: backup first, read 'Backward-incompatible changes', watch custom integrationsrecommendation · unverified · Each release announcement lists backward-incompatible changes; read them before updating. Enable automatic backup before updates, check custom integrations (e.g. from HACS) for compatibility, and know that recovery mode starts Home Assistant with only a minimal set of integrations when something breaks.