Apple releasing the first iOS 13 and macOS Catalina public betas today

Announced three weeks ago at WWDC, developer betas for iOS 13 and macOS 10.15 Catalina have been available ever since. Today though, the general public can finally begin testing them out, as they're available through Apple's public beta program. People who have been using the developer betas warn against installing the public betas for now, since they are quite unstable and buggy this time around.