I moved this from the Ask in Your Language category as that is more for human languages and not OS or computer languages.
Linux comes in a wide variety of flavors, some are easy to use and some are a little trickier. For a first-timer I usually recommend Ubuntu, but if you google “good linux distro for beginners” you will get plenty of options. I recommend Ubuntu because the basic desktop looks very similar to the classic Windows desktop so it’s not a huge culture shock.
A lot of this depends on what you’re going to be doing with your computer. For most common tasks like word processing, web browsing, etc the general speed and ease of use will be approximately the same for windows vs linux. The programs will look a little different in some cases but the functionality is the same.