Microsoft launched a page that clearly explains how to upgrade your existing system in-place from a legacy Windows OS to any Windows Vista version; or, in the case of certain systems, whether you'll need to perform a completely clean installation. Certain legacy OS' require a full system installation while others will allow for an in-place upgrade. Depending on where you're coming from and where you're going, you should determine which scenario applies to you.
Windows 11 in the Dev Channel fixes Windows Security app issues, and more
windows 11 insider preview
Build 22621.290 & build 22622.290
Microsoft releases two Windows 11 builds to Insiders in the Beta Channel
windows 11 build 22622.290 screenshots