Linux is a really good privacy-friendly alternative to Windows, and nowadays it's easy for anyone to use. Modern Linux works just like Windows or Mac, you do not need tech skills to use it.
If you want to buy a computer with Linux preinstalled, there's a really good site that lists vendors around the world:
(One of the major vendors, @Purism , is on the Fediverse.)
See also:
https://switching.social/ethical-alternatives-to-windows/