as above on terminology and it is important when talking to the script readers not to give them any way they can fob you off - they will do that most of the time without any help from you
if you only use wifi then as you understand it then thats down - but the wifi is the secondary function - to have wifi you need to have an internet connection to the hub - thats the start so be more specific if you dont have any wired devices in the house - assuming that what hub have you got and what are the lights on the front doing - that will help people here - maybe not offshore - get a better understanding of what the problem may be - what other questions to ask and [maybe] what the problem is
hopefully some of that gives you a better understanding in getting to a solution or at least some understanding rather tan a load of links to something that either wont work if your connection is down or asking you for to run a test that you may not be able to do