There's a home automation protocol that's been around for over 20 years called KNX. It's backed by big names (ABB, Hager, Gira, Osram, Mean Well) however outside of Germany it's pretty much unknown. Compared to ZigBee or Z-Wave it's wired and the config is stored in the devices themselves, so there's no single point of failure. It has strict certification requirements so you can be guaranteed that products from different manufacturers will work together (this does mean its more expensive though). The quality of the hardware (esp. motion/presence sensors) is a lot better than what you can buy from Amazon or the 'smart home' section in your local Walmart.
There's plenty of content (in German) on YouTube about it, and forums:
There's plenty of content (in German) on YouTube about it, and forums:
https://m.youtube.com/channel/UCiCPbFz0Ld6mera2fNDRWzw
https://knx-user-forum.de/