How to create app icon

Create your icon

Create icon at Canva. See [Angela video](- Anglea Udemy ) for example.
Download

Upload to App Icon Generator

Upload the icon you just created to App icon generator.
Generate and download assets.

Import into Xcode

Open directory to where assets live from Xcode

Unzip icons you downloaded from icon generator
Drag AppIcon.appiconset from generated dir into Assets.xcassets dir and have it Replace icons there:

Voila 🎉.

Links that help