The macOS Catalina Golden Master Edition is the final version of the update that will soon be available to the general public. The new macOS Catalina software can be downloaded using Software Update in System Preferences, after installing the appropriate profile from Developer Center.
MacOS Catalina eliminates the application iTunes, splitting it into Music, Podcasts and TV applications. The three new apps offer similar functionality to iTunes, but are broken down by category. Device management iOS, is still available on the Mac, but is now being made through it Finder instead of iTunes.
With a new Sidecar feature, you can convert it iPad on a second screen for the Mac at the touch of a button. Apple Pencil also works with Sidecar, so you can turn your iPad into a design tablet for applications like Photoshop and Illustrator.
The Apple Watch can be used to approve passwords and other information on macOS Catalina. In addition, the Poppy with T2 chips now support Lock Activation and thus become safer. There's also a new Find my Mac application that lets you track your devices even when offline or in the case of laptops when they're closed.
Another feature available on Mac and iOS devices is Screen Time, as well as Project Catalyst, a new Apple initiative that will allow developers to easily transfer applications from the iPad to the Mac to increase the number of available applications for Mac.
There is a new photo interface that organizes your photos by day, month or year. There is also a new start page for Safari, Mail has new tools to mute emails and block unwanted senders, and the Reminders app has also been repaired.
32-bit applications no longer run on macOS Catalina, which you need to know before installing the beta.
Apple plans to release MacOS Catalina sometime in October.