Current latest Win10 version is 21H1.

The newly launched Win11 may not be suitable or compatible as it required TPM2.0 hardware for token authentication. Also the hardware check apps from Microsoft is totally useless and unable to verify your hardware correctly thus you may end up upgrading to Win11 but unable to boot the OS.

Worst you may end up to reformat your computer again.....

Always do a backup before any major OS upgrade.