7
Need to order switches
(lemmy.world)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Zwave is a closed standard and all your components will be slightly more expensive and harder to buy.
Zigbee is much more open, plus maybe threads will become a big thing one day.
I only use zwave for legacy reasons, I've been using it since before zigbee was a thing and I still have a handful of devices on it.
IKEA is a good source of cheap zigbee components to play with.