Definitely possible. All servers are just computers but in a different form to work best in a datacenter.
Can someone, refer me to video tutorial, on how to do it exactly? or Can somebody give me a link, to an article which teachs that?
Doing a quick google search returned many howtos regarding this. It's recommended to install some gnu/linux distro and set it up as a server.
Can you make your PC a server? Yes. Should you? Probably not. Most internet providers will suspend your internet if they find you hosting a server on a residential connection.