distro. Their warranty.
Why Linux
Your computer should work for you. Not the other way around.
The short version
Linux is the operating system that does not treat you like a product.
It is free as in beer and free as in you can see what it is doing. It runs the servers that hold up the internet, the phones in your pocket (Android), and — when someone bothers to make the hardware behave — a perfectly normal laptop on your kitchen table.