Again, seriously question why you need this but you could look into ClamAV. If you're coming from Windows you're going to be in for a shock if you blindly try and adapt every concept from Windows straight to Linux.
It's not a bad thing to have an antivirus, especially now that we see more viruses made for Linux specifically. I still don't worry much myself, because the number isn't that huge, but if there was an easy to use antivirus GUI app I think I'd try it
Anyone is welcome to install an AV on their device if they so choose. I was more alluding to the fact that there are many things you should be doing to prevent malicious programs from running on your computer in the first place. By the time it makes it onto your system you're really just hoping that an AV would happen to catch it.