I think at least a few people here run Linux -- likely more will when Win10 hits EOL in a couple of years -- so here's a couple of I think useful articles on basic stuff some folks will need to know in 2025...
How to encrypt a file on Linux (and when you should)
zdnet[.]com/article/how-to-encrypt-a-file-in-linux-and-when-you-should/
Linux File Permissions: Everything You Need to Know
petri[.]com/linux-file-permissions/