Start with the topic guide.
Constants and variables, optionals, structs and classes, enums with associated values, protocols, extensions, closures, generics, error handling, automatic reference counting, value and reference semantics, async, await and actors, property wrappers, and Swift Package Manager.
This is a learning outline. A complete worked tutorial has not been published for this topic yet.
Concept scope
Swift Language Fundamentals: 14 short lessons, one for each concept. Constants and variables, optionals, structs and classes, enums with associated values, protocols, extensions, closures, generics, error handling, automatic reference counting, value and reference semantics, async, await and actors, property wrappers, and Swift Package Manager.