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How do you even use CarPlay? Know it may be a stupid question.

First step is to see if your vehicle is compatible with it.

Second step is to connect your phone to the vehicle.

I also found out the hard way that Siri must be enabled for CarPlay to work.

This might be of some help:
 
Thanks. Never used it before.
It’s nowhere near a perfect experience, but it has certainly come a long way and is way ahead of Android Auto and the vast majority of automakers native infotainment offerings.
 
CarPlay is basically a second screen for your phone. Developers can optimize their apps for display on that screen. So for example your turn by turn map directions with a live map will appear on the large screen in the middle of your car's dash.
if you've got a homekit garage door. the open door button will magically appear when you get close to home.

Only certain categories of apps are allowed, to avoid distracting you from driving. so no video playback or text messaging apps, but a few audio and navigation apps.

Some cars have a smaller display built into the instrument cluster. Sometimes CarPlay can use those to display things like next turn in navigation, But that depends on your car's manufacturer and the individual app developers for that to work.
 
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