Ok...let´s start from here...
What do you think of wikipedia?

Nice.

Wiki is a wonderful source of information that provides you, largely, with what you need to know. Don't take it all as fact and you'll be all set. The extrenals links are very handy.

IMO Wikipedia is a very unreliable reference on its own, but it sometimes provides interesting information (especially pop culture stuff) that can be further researched and possibly substantiated.

In an ideal world all Wiki contributors would be unbiased, mature, honest, educated and intelligent, but, as the comical warnings here point out, that is not the case.