Wikipedia: Five Pillars
Fundamental principals of Wikipedia.
What Wikipedia is Not
Among other things, Wikipedia is not a paper encyclopedia, a "publisher of original thought," a blog, a "soapbox or means of promotion."
On Wikipedia, "notability is a test used by editors to decide whether a given topic warrants its own article."
Identifying Reliable Sources
"... third party, published sources with a reputation for fact-checking and accuracy. This means that we publish the opinions only of reliable authors, and not the opinions of Wikipedians who have read and interpreted primary source material for themselves."