Upgrade to Linux
Resources to test, install, and run your first instances of Linux and open source software.
This is nice but there are already tons of "how/why to start using Linux" websites. Not sure if we need another one.
I still keep my old Windows disk as a second boot option. Might finally wipe it at some point.
I was scared to install Linux as a daily driver at first. Then Windows Update screwed up my install and I said "Screw it, I'm not installing Windows again". Basically Windows took the decision to uninstall it for me :)
I'll probably just keep a Win10 VM if need be.