Once you start reading eBooks, one of the first things you should do is download and install "calibre" on your PC. To quote the calibre web site: "calibre is a free and open source e-book library management application developed by users of e-books for users of e-books. It has a cornucopia of features divided into the following main categories: Library management, E-book conversion, Syncing to e-book reader devices, Downloading news from the web and converting it into e-book form, Comprehensive e-book viewer, Content server for online access to your book collection."
Note that "free and open source" part. Calibre is a Swiss Army Knife for e-Reading, and it is 100% free. Now, you can donate if you want. And I have. And I'm sure I will again. And I think you should, too. But you don't have to.
So, where is this paragon of programming? Browse to http://calibre-ebook.com. Poke around. View the demo. Then grab your own copy. You will be blown away by the things you can do with it.