Ok, so first things first.
It is possible to find pirate versions of the Windows 11 beta on the Internet right now, but given that it is illegal to pirate software, and given that pirate sources of software aren't exactly what you'd call trustworthy, as they're often served with a no-so-healthy side serving of virus, trojans, ransomware or other malware-du-jour, it's definitely NOT a wise move to seek the leaked versions out.
The only LEGAL and safe way to try out the beta version of Windows 11 is to sign up for the Windows Insider Program, with this blog post at Microsoft containing all the details.
You'll also need a Windows PC that is compatible with Windows 11's minimum requirements, which you can see here.
You can also download the free PC Health Check app to determine whether your existing computer qualifies.
In short, however, you'll need a minimum of dual-core 64-bit CPU with a minimum speed of 1Ghz or compatible SoC, 4GB or more RAM, 64GB or greater storage, system firmware that is UEFI and Secure Boot capable, has TMP v2, a graphics card that is compatiblee with DirectX 12 or later with a WDDM 2.0 driver, a 9-inch or larger display that is at least 720P capable, and an Internet connection and Microsoft account.
Windows 11 has a new interface, new icons, new start menu, new widgets section, new tablet capabilities, the new ability to run Android apps and plenty more.
You can see iTWire's article on the Windows 11 launch here, which includes the full Windows 11 launch event and a range of other videos.
You can sign up for Microsoft's newsletter on Windows 11 here.
Here's a video on the Windows Insider Program: