Hi
@Andrew Reed
You can press on the minus (-) button of the controller at any time to get a description of what a button does. That would help you identify its function.
- #1 : The Red ! indicates that if you build the district on that particular tile, a caracteristic of that tile will be suppressed by the district (it may be a forest, a marsh, a farm building, etc.)
- In the case of question #2, the sun serves to wake up a particular unit.
- #3 : I did not find the "dot symbol" you were referring to, but if you use the - button, you can have a description of its function.
I've linked to a written Beginner's guide for Civilization VI in the fifth post of this thread. I hope it helps.