I personally recommend ftbwiki.org for help with mods. It covers most things that a mod can do. Also, the "magical" mod, Thaumcraft, has an in-game book (which is required for progression) which details everything found within it, and its addons. If you are having issues figuring out how to do something, you can contact me (Azg99) here, via the comments, or on my youtube channel, https://www.youtube.com/channel/UCQKKOEwWoWUB9se4kdesxCQ, again, in the comments section.