make a summary from the most important stuff at wwdc 2019

WWDC 2019 was a significant event where Apple introduced a variety of new technologies and updates across its platforms. Here are some of the key highlights:

1. iOS 13: Apple introduced iOS 13 with a system-wide dark mode, a revamped Photos app, and new privacy features like "Sign in with Apple." Performance improvements were also a focus, with faster app launch times and smaller app download sizes.

2. iPadOS: Apple announced iPadOS, a new operating system specifically for iPads, which included features like a redesigned home screen, improved multitasking, and better Apple Pencil integration.

3. macOS Catalina: This update brought features like Sidecar, which allows an iPad to be used as a second display for a Mac, and the end of iTunes, which was replaced by separate apps for Music, Podcasts, and TV.

4. watchOS 6: New features included a dedicated App Store for Apple Watch, new health and fitness features, and additional watch faces.

5. tvOS 13: Apple introduced multi-user support, a new home screen, and support for Xbox and PlayStation game controllers.

6. Mac Pro and Pro Display XDR: Apple unveiled the new Mac Pro, a high-performance desktop computer, and the Pro Display XDR, a high-end monitor designed for professional use.

These announcements highlighted Apple's focus on enhancing user experience across its devices, improving performance, and expanding the capabilities of its platforms.