Linux is a free alternative to windows. You don't have to worry about virues, spyware, or adware!
99% all the software you will need is free to download. You just open up the software manager and find what you need. The ONLY disadvantage of Linux is games. If you are a big video game person then Linux might not be for you. You can get loads of games for Linux, just not some of the newer 3D games.
Linux also runs really well on older computers that windows just bog down.
If you don't use your computer to play video games then Linux should be perfect for you.