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What Do I Need To Know?
You need to be able to recognize what's in a URL (Universal Resource Locator) or web address.
Example:
http://rathke.us/bizwebpage/index.html
can be translated as:
(protocol) :// (domain and/or root folder for site) / (subfolder) / (web page)
"http" stands for Hypertext Transfer Protocol
"html" stands for Hypertext Markup Language html (by now you should be really familiar with HTML and be able to answer any question regarding TAGS and ATTRIBUTES).
You will need to understand what a protocol is and what it's there for. For more on protocols, check here.