I am a big fan of Linux Mint - it works well on all sorts of computers and seems to rarely have any driver issues.
If you’re installing on an older machine consider the XFCE edition. If it’s a newer machine then the Cinnamon edition is good too.
The difference between these is the ‘desktop manager’ i.e the software that gives you your taskbar and shortcuts. Cinnamon is a little more demanding on older machines but if you’re using a fairly new machine it’s more feature packed and is the one written by the Linux Mint developers so it works well.
I think you pretty much just install it like Windows, I have done it a couple of times and its quite easy
Just make sure you backup your data and have a spare copy of windows just in case things don’t go to plan then start your computer from a USB
You can use something like Etcher to create Linux usb after downloading the one you want, most of them tell you how to install it on the downloads page