I have been using the Kindle e-book app on my laptop and Android phone. After Christmas I purchased a Kindle Fire.
There is an app you can download to read Kindle books on your computer if you do not have a Kindle. They frequently offer free Kindle books, one source for finding free books is Jungles Deals and Steals. The website keeps up to date on deals and sales at Amazon.
Today, one of the free books is Saving for Retirement without Living like a Pauper. I downloaded it previously when it was offered for free but have not had a chance to read it yet.
The book was free at the time of this post, make sure to check that the price is still $0.00 before you order it. They are only offered free for a limited time.
Many public libraries, including the Fargo and Moorhead libraries offer e-books that can be checked out.