Sometimes you need to know where the documentation is. Here is documentation for SwiftUI used in IOS development.
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/thebasics
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/basicoperators
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/stringsandcharacters
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/controlflow
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/collectiontypes
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/closures
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/classesandstructures
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/methods
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/initialization
https://www.swift.org/blog/?id=10
https://developer.apple.com/tutorials/swiftui-concepts/exploring-the-structure-of-a-swiftui-app
https://developer.apple.com/videos/play/wwdc2020/10119
https://developer.apple.com/documentation/swiftui/scene
https://developer.apple.com/documentation/swiftui/textfield
https://developer.apple.com/documentation/swiftui/observedobject
https://developer.apple.com/documentation/combine/observableobject
https://developer.apple.com/documentation/swiftui/fitting-images-into-available-space
https://developer.apple.com/documentation/swiftui/images
https://developer.apple.com/documentation/swiftui/building-layouts-with-stack-views
https://developer.apple.com/documentation/swiftui/textfield
https://developer.apple.com/documentation/swiftui/observedobject
https://developer.apple.com/tutorials/swiftui/creating-and-combining-views
https://developer.apple.com/documentation/widgetkit/swiftui-views
https://developer.apple.com/sf-symbols
https://developer.apple.com/documentation/swiftui/list
https://developer.apple.com/documentation/swiftui/scrollview
https://developer.apple.com/documentation/swiftui/navigation
https://developer.apple.com/documentation/swiftui/scrollview
https://developer.apple.com/documentation/swiftui/gestures
These links will help you find the syntax you need.