Ever heard of Google?
If not, it's a search engine. The website is www.google.com. You type in the search box whatever you're interested in, and then click the search button. After you do, tens of thousands, or more, suggested websites will come up.
For example, if you enter "descriptive notation" in the Google search box, the first suggested website that comes up is wikipedia's entry for descriptive notation.
https://en.wikipedia.org/wiki/Descriptive_notation
The second suggested link is this one:
http://www.wikihow.com/Read-Descriptive-Notation
Knock yourself out.
I have no clue how to understand descriptive notation. Although i don't need it,i wanna learn it. Please help