nope sorry,The simple version?
Linux is an operating system that comes in a lot of different versions. Essentially the basic code is free for anyone to modify and redistribute.
It is possible to 'dual-boot' - you can install Linux and leave your Windows install as it currently is, assuming you have enough hard disk space.
Some things Linux does very well and some things are a real pain in the arse until you practice.
I would suggest if you are going to try Linux then you spend a bit of time looking for a version (distro is the phrase) that is easy to use and free, Ubuntu used to be recommended but no idea on the current versions. Then either dual-boot or download virtual machine software to see if you get on with it.
Virtual machines allow you to effectively run Linux from within Windows and won't bugger up your Windows install if it all goes Pete Tong. Virtualbox works well and is free - Oracle VM VirtualBox
Right, now that I've done my very simple version stand by for lots of discussion about sudo and root and kernels from people who actually know what they are talking about
I couldn't even read that , so linux is out for me I suppose.