@user299 Chiming in. Most wifi stuff is cloud based. This is anathema to what Hubitat is about. Hubitat's main draw is the lack of need of the cloud to control devices. Putting everything in your hands. If the internet or an associated cloud service goes down your stuff will still work. An example of this is when AWS went down and alexa didn't work for anyone. Our stuff just worked because it is 100% local. Now there is some stuff directly supported by Hubitat that is wi-fi such as Lifx and Shelley products. These items though are 100% local. There are some cloud based products that are compatible but that is through Community written integrations. HE doesn't support these (I mean support as in if there is a problem with the program, they don't help you since it's not theirs)..
Now as far as your lightify, that is zigbee. It can pair with HE but it has to be reset first. Some of the lightify is ZLL based zigbee. These make bad repeaters. So when merged on the same mesh as ZHA devices (sensors, etc) the mesh can fall apart when the unit turns off because it stops repeating. The solution to this is to isolate ZLL bulbs/lights on their own mesh either using another hubitat or HUE bridge. (These can be directly controlled by hubitat in a single envoriment).
Have you looked at the compatibility list here?
https://docs.hubitat.com/index.php?title=List_of_Compatible_Devices
Now a lot of things in the list do work that aren't on the compatibility list with the generic drivers provided it uses standard z-wave or zigbee attributes. When looking at stuff, read the forums or post a message. Chances are someone has it or tried... Or there may be a community driver available. In fact sometimes the community driver is better than the built in driver.
Install the Hubitat package manger. It will make life much easier 
Start with the simple automation app instead of Rule machine. Work your way up.
Do not be afraid to ask questions...We're here to help
