Tried to learn while making my own project, and ended up getting stuck and confused. So I decided to go back being a beginner again because I had no idea how does SwiftUI works.
I'm currently working on the #100DaysOfSwiftUI, and I just finished the 23th day of the tutorial. I just wrote at the this day because it's the first time that I need to accomplish it for 2 days, including the optional.
Man, my mind keeps saying "Come on, man. I want to end this reading stuff ASAP. I felt shit for not grasping this thing faster than the previous days.".
But today, I finally understand that the first part of how SwiftUI works technically.
You're doing God's work, @Paul Hudson.
If you're interested learning on SwiftUI for native iOS development, check out this page:
Here goes to the next tutorial day!

Hacking with Swift
The 100 Days of SwiftUI
Follow the 100 Days of SwiftUI and learn to build apps for free.