Getting Started with Scrumdinger
Learn the essentials of iOS app development by building a fully functional app using SwiftUI.

Before you start the course, take a few minutes to familiarize yourself with the background requirements, key concepts behind SwiftUI, and the app that you’ll build.

https://developer.apple.com/tutorials/app-dev-training/getting-started-with-scrumdinger

The Basics

https://docs.swift.org/swift-book/LanguageGuide/TheBasics.html 

App Builders Academy-A Good Start to XCode

How to build an app with Xcode and Swift

Save time in Xcode - the most important shortcuts