These are great.... They just work... Also have battery and temp reporting.
You need the pro bridge 2 to integrate into Hubitat. Very worth it. Can probably pick it up cheap off of ebay.
These are fantastic and come with a 48" pig tail if you want to use it (optional)
Pretty much anything. I like the Hue indoor sensors (pair directly to hubitat)
My go to are NYCE sensors (Humidity/Temp/Motion) for the bathrooms. Moes for hallways.
Now onto stuff you have
You need the Pro 2 bridge. L-BDGPRO2-WH
Brand/Model?
There is some integration
Install built in chromecast connector
same as above
I don't like the My Q myself as it's cloud based. I much prefer using a zooz zen-16 with an ecolink tilt sensor. It can run inline with your oem garage system. That said, you can use MY Q lite available in Hubitat Package Manager.
The API may allow some stuff to work. Dunno.
Aquara stuff works horribly.
Since you're new, I recommend glancing at this. It might help you avoid some gotchas..