For those who get past the "Try a Linux live-USB" stage, you can also install both Windows and Linux on the same computer, and choose which one you want each time you start up the computer. I did this for a few months around the year 2000, when I had not yet found Linux alternatives for all the Windows software I used at the time, and so I would go back and forth between them. But by 2001, that had changed, and I found I was never booting into Windows any more.
(After 2004 I got into another hobby that required a Windows-only application, and went back to dual-booting for a few years, just for that one single application.)
But big_teee's basic point is worth underscoring: if you are a typical computer user, Linux is easy to try, and quite likely will meet your needs. If you are a more advanced computer user with a technical mindset, Linux will very likely meet your needs, because you will know how to make it do so. This is why engineering and science and research departments are full of Linux users.
The people least likely to be served by Linux are very specialized computer users, who spend their time using extremely expensive proprietary software (3D CAD, custom financial or CRM software, etc). That type of software will often not have a Linux version.