Hi. I'm David, and I'm happy to help you.
It's technically possible to run both Windows 10 and Windows 11 on the same PC using a dual-boot setup. However, this only works if your hardware meets the minimum requirements for Windows 11.
Another detail: to use both systems legally, you'll need two separate licenses, one for each installation.
That said, I generally wouldn't recommend dual-booting unless you rely on legacy software that only runs on Windows 10, which is increasingly uncommon today.
Please do the following:
Download the PC Health Check from the link below, install it, and see which requirements your computer meets and if there are any that it does not meet.
https://aka.ms/GetPCHealthCheckApp
After installing, open PC Health Check. Then, under "Introducing Windows 11", click "Check now".
If you want, share a screenshot of the result. Use the shortcut "Windows + Shift + S" to use the screenshot tool.
I await your reply.
Feel free to ask back any questions.