The Internet has always been a passion of mine, since the first query I performed on the production line at Apple Computer Inc. in the early 90's. Another rework troubleshooter told me to type a website into the address bar and hit -Enter-. In those days, the search engines weren't as popular and you had to know the website you were wanting to visit. Sites like MSN.com and news websites were starting to be popular only because they were easily remembered and passed along to others.
In today's environment, its harder to know what is really going on behind the scenes. Its important to know about internet security and what info to not keep on your computer (at least not encrypted). If you use more than just the internet browser, you may have come across problems with protocols or ports. This is important in the sense of these are communication methods for computers are openings in your firewall like windows and doors. You might check out the hardware section for the information on routers, where this is performed.