So this is an awfully general question to be asking, but I can offer you a few suggestions. First off, check out our FAQ! It breaks down the war into a number of topics, and should provide you with plenty to read up on. And ideally, they should lead you to more specific questions you can ask here! Also check out our extensive booklist, available also on Goodreads. There are a ton of great resources there, some general histories, and some very specific.