A few months ago I converted my backup computer from Windows 10 to Linux Mint, due to my computer was too weak for Windows updates. It's cool with Linux!
Linux is actually the kernel "core" in the software. When installing Linux on a Personal Computer, you select distribution (distro) and each distro has often several desktop environments to choose from. They vary in how "heavy" they are in resources, and some are more suitable for this or that type of work. So in comparison, in Windows world (or macOS), there is basically one distro and one desktop environment, while Linux have tons of them - and very many open source and free (macOS is a Linux sibling, but not free open source). As well as many free applications.
A drawback there are so few PC that can be purchased with Linux from start, but some exist (as seen from my Swedish horizon). Maybe, some signs, it is becoming somewhat more available now.
Anyway, Linux is very nice and interesting.
There are tons of articles and to read on internet about Linux. And of cours books to read. Or read a magazine like Linux Format. Linux Journal has ceased to exist, but their web site with many articles is still up and running. The article What is Linux? from Linux.com is a good start to get a basic idea of Linux.
Talking about general about Open source and more, I like the podcast Command Line Heroes, from Red Hat.
Another podcast I listen to is MintCast, about Linux Mint and Linux in general, and other technical stuff.
Please see also my own list of articles with Linux tag.
29 January 2019 (with later updates)