Anyone here expert in Apple watch app development. Can you share books, tutorials, sites that can help me? I have little knowledge of SwiftUI, expert in Python, intermediate in C++. I plan to learn this as my next hobby. I learn by doing- but before doing I need to understand the theory well - details like why files are so arranged- what does each file created by Xcode really does. A good overview of the basic structure of Watch APP, and details of different sensors available on different watch series, how to use them etc...