WWDC 2026 focuses on Liquid Glass and Apple Intelligence, with Platforms State of the Union as the starting point. Don't feel pressured to learn everything immediately, as over 100 sessions are available at your own pace. The Apple Developer app or YouTube are recommended for watching sessions, which are typically concise and to the point. Swift 6.4 introduces quality-of-life improvements and new features like FilePath and Swift-C interop. SwiftUI sees mandatory Liquid Glass changes, minimal menu icons, and a prominent tab role, alongside new document APIs and reorderable containers. Modernizing UIKit apps involves adapting to resizable environments and required UIScene lifecycles, while AppKit apps should embrace control events and keyboard navigation. Xcode 27 offers a customizable toolbar, coding agents for tasks like localization and prototyping, and an improved device hub. Instruments provides new modes for profiling, including a Swift executors instrument and a Foundation Models instrument for debugging agentic apps. MetricKit is rebuilt with a Swift-first API for collecting app performance metrics. Developers can migrate to Swift Testing, with Xcode's coding assistant aiding the process. Xcode Cloud streamlines build, delivery, and automation workflows. SwiftData receives updates like sectioned fetch requests and the ability to store Codable types. Design principles emphasize purpose, simplicity, and clear naming, with guidance on crafting intuitive search experiences. Accessibility enhancements include improved VoiceOver navigation for reading apps and AI-generated subtitles. Apple Intelligence expands the Foundation Models framework, making it open source and offering on-device and Private Cloud Compute options.