Microsoft offers a free tool called Windows 11 Media Creation Tool to help you create a bootable USB drive or DVD for free
Create Windows 11 Bootable USB Using Media Creation Tool
A Windows 11 bootable USB drive can be used for multiple purposes, including clean installation of Windows 11, upgrade and existing Windows OS, troubleshooting startup problems include Windows won't boot, and performing offline installations on multiple PCs. Microsoft provides an official Windows 11 Media Creation Tool, which helps you create a Windows 11 bootable USB drive or DVD for free. Also, you can use third third-party tool Rufus to create Windows 11 installation media (Bypass TPM 2.0 and secure boot verification).
Create Windows 11 installation Media
If you plan to install Windows 11 on your device, you’re likely to need a bootable USB drive, and here are two ways to Create Windows 11 Installation media Using Media Creation Tool or Rufus Tool.