If you are considering a software, hands down, get Scrivener. It’s cheapcompared to other softwares ($ 35-50 for a lifetime license, depending if you find a good coupon online) and it’s amazing. It will allow you to swap chapters around, add research material, play with outlines and most importantly to export your work in ANY FORMAT, from a manuscript to an e-book ready for Kindle publication without any coding on your part. Get it, just do it. (I have no money in Scrivener, I swear!)
This is what an outline looks like in Scrivener; you can swap chapters around as you like.
Another cool thing you can do with Scrivener: you can take an editable “picture” of your chapter at anytime. You can compare that chapter with the previous version or roll back to it.
Things that Scrivener is not ideal for. If you want to edit somebody else’s work do not use Scrivener. As of today (or as far as I know) there is not a good way to “track changes” like you would in Pages or Word.
Who am I to give you advice?
I am an indie author who did it all herself and I’m here to tell you how ;) I am the author of The Italian Saga (#TIS) A series of YA novels taking place in Italy.