Let's face the truth that most SwiftUI and even iOS development courses teach you how to build ugly and hideous applications but not this one.
Your first project will be an awesome cards app created with SwiftUI. You will learn many useful iOS 13 app development features with this hands-on video tutorial.
Let's build an Avocado Recipe iPhone and iPad app with SwiftUI. You will learn further useful design and layout techniques in this video tutorial section.
Your third project will be a quite surprise. Build a new app and create custom interfaces with SwiftUI framework. The best way for to learn code by developing practical iOS 13 apps.