So where do I start if I want to switch to Linux from Windows?
When switching, there's a few things to decide:
what hardware are you using?
If you use AMD, you should be good. If you use NVIDIA, your results may vary. (its not horrible, but NVIDIA often has issues of Linux)
what is your focus?
depending on what you do with your computer, you should consider dual-booting. Some specialist software either have no Linux versions or no great open-source alternatives. If you mainly do gaming, web browsing, listening to music, doing office you should have no problems.
what distro suits you?
I would recommend a user-friendly distribution like Ubuntu or Linux Mint. I personally use Manjaro (because Valve recommended it at some point and I just stuck with it)
what desktop environment is for you?
there is a great range of desktop environments out there. I recommend KDE, but its best to check out your options, maybe watch a youtube video showcasing what the offer, how the user experience is, etc
then, the installation and migration:
installing Linux is fairly easy. A distro like Ubuntu will let you boot into a live environment where you can try the system out without installing anything. (You might have to disable SecureBoot, and select your bootable USB stick in your BIOS as the startup volume)
From there, you can then start the installer that will guide you through the process. Dont forget to make sure your data is safe! You can choose between dualbooting Windows+Linux or installing Linux alone. If you dualboot, Linux will set up a bootmenu that lets you choose your OS every startup.
after that, daily usage:
Linux can take a while to get used to and you might run into problems. The small userbase (compared to Windows) of it means that software might not run, hardware might not be supported (which is why trying things out via the live environment is a very good idea). Most distros have a forum where lots of questions get answered; and theres Reddit to search for solutions if you run into problems.
We also have a Linux thread – and another one; and I recently posted about distros