Apple, yesterday, introduced the new iOS 12, macOS 10.14 Mojava, tvOS 12 and watchOS 5 which had many changes and updates. If you missed you watch the full keynote video then you can watch it now!
Apple has posted it’s keynote video on it’s official site. Simply go through this link and you will be able to play it on any browser or mobile devices.
Watch the 2018 WWDC Full Keynote Video, it’s interesting!