I've been using Reolink wifi cameras at my place for 5 years now with great results (I've just bought the reolink doorbell too).
All integrate perfeclty into my Synology nas (Synology's survelliance station is epic, the mobile app is great too).
Don't get any of the JB/harvey norman/officeworks/bunnings swann setups or propriatary stuff that means you have to use their cameras with their NVR's etc it gets messy and the software is almost always clunky.
I've got my NAS setup doing 24/7 recording with motion detection and 14 day retention. I much prefer constant recording to recording on motion.