There are a few posts on here before mine that were very informative as well. I'd like it if certain aspects of the story were were bolded then a brief explanation was provided below it. It would be even better if people could include links citing their sources.
For example:
Races
Wildwood Elezen
From the official site:
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http://na.finalfantasyxiv.com/#/world/races/elezen/l
According to Prosperlain, the Officer at Arms in Gridania:
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http://www.eorzeapedia.com/wiki/en/Prosperlain
If you're really curious though, there are sites for this kind of thing like eorzeapedia and such. Both of the above chunks I've used for my example can be found there. Including links is a good way to cite sources regardless because it let's readers interpret for themselves while still backing up a poster's claims.