Yes, “reduce, reuse, recycle” in that order. It is better to sell or give away an old PC instead of just sending it for recycling or even landfill.

The Linux experience has changed quite a lot over the years. You’re unlikely to have trouble getting your computer to work with it now.

You’ll be more vulnerable to malware because it won’t be patched against newly discovered exploits.

Teams vs Teams for Work or School vs New Teams. .NET Framework vs .NET Standard vs .NET Core vs what they just call .NET now. Office vs Office 365 vs Microsoft 365. Microsoft is never not confusing.

There’s WSL now in Windows 11 - a built-in, pretty performant instance of Linux. The recent versions run a proper Linux kernel I believe (the older ones were more of a compatibility layer over Windows APIs). I’m not sure what the limitations of WSL are. But there is already some kind of Linux in Windows. I use it for the odd utility and to avoid having to learn PowerShell.

You forgot the endless pages of trick questions you have to periodically step through to get into Windows. One wrong move and you owe Microsoft money every month.