Wikipedia is a good place to start. The article is pretty balanced for the most part. howstuffworks.com has a decent history, although I have an issue with the emphasis the article places on "huge" stuff like massive gap jumps and whatnot. It also seems to rely pretty heavily on UFF as a primary source; not in itself a bad thing, but just something to bear in mind when reading the article.
Otherwise, the rest you just kind of pick up by soaking up the culture.

Welcome to APK, btw!