Hands-on-verified reference for how devices, protocols, and hubs actually interoperate: per-device compatibility profiles, protocol mechanics (Matter, Zigbee, Z-Wave, Thread), hub/border-router requirements, and ecosystem support (Alexa, Google Home, Apple Home, Home Assistant). This is the pre-purchase and 'will this work with my setup' destination, serving comparison and verification tasks rather than active-failure diagnosis. Includes protocol comparison tables, spec version explainers (what changed between Matter releases), and glossary-style term pages (fabric, commissioning, border router, bridge vs. controller) that other groups link into. Excludes active troubleshooting steps (Troubleshooting Center) and dated breakage events (Update Watch), though compatibility profiles link out to both when relevant.