Just another quick word about FC. While much (not all) of FC is directly out of FA, there are many topics that are spread over many pages in FA and FC consolidates all this into one card pertaining to that topic. For example, there is info about S.pyogenes on FA pages 150, 250, and 350 (those page numbers are made up), but FC puts all of it on one card called "S.pyogenes". So instead of having to look through the FA index to read everything about S.pyogenes, you just need to read the FC card.
I probably could've explained that better, but I hope you get the point. FC consolidates info and makes it much easier to review things all at once.