Windows 10 was released in July 2015 and support will continue through October 2025. Windows 11 was released October 5 2021, with a slow release to hardware meeting requirements. The roll out continues through mid-2022. To install the new OS release, go to Settings > Update & Security > Windows Update and click Check for Updates. If available, you’ll see Feature update to Windows 11. Click Download and install. Another method is to use the Windows 11 Installation Assistant.
For individuals using the Dev Channel of the Windows Insider Program, build 22523 was released. Windows Central does a nice overview of the changes between the initial roll out and the latest development build. To try the new improvements, you will need to join the Dev Channel.