Re: "Like I say, there’s no user guide to tell you what all the icons means."
I went to www.apple.com and searched for "iPhone X user guide". The results, from the top, were...
https://www.apple.com/iphone/
https://www.apple.com/iphone-x/films/
https://www.apple.com/iphone-x/specs/
https://www.apple.com/iphone-x/
https://www.apple.com/iphone-x/ios/
https://www.apple.com/iphone/compare/
https://www.apple.com/iphone-7/specs/
https://www.apple.com/iphone-8/specs/
https://www.apple.com/iphone-se/specs/
https://www.apple.com/iphone-6s/specs/
https://www.apple.com/shop/buy-iphone/iphone-x
https://www.apple.com/iphone-8/
https://www.apple.com/iphone-battery-and-performance/
https://www.apple.com/iphone/LTE/
At this point, I lost the will to live. It's all sales bumf, not a single user guide.