The internet is a big place. As such, there are many resources online other than this one, which are absolutely worth checking out. Remember that this isn't exhaustive.
You might see references to Sinitar Gaming. There is a 20-page essay on why his "guide" isn't recommended. Also DerekDiablo, who has another 16-page essay on why.
There are of course hundreds of modding servers, larger general ones and smaller ones for individual community members.
UsefulMods Repository (outdated, being worked on, use as a resource with caution)