Ebooks are a great way to read content on your digital devices: desktop, mobile, and tablet. Amazon have also now made it possible to send EPUB books to actual Kindle devices through their "send to kindle" facility.
If you purchase an Ebook from this site you will receive both a PDF book and an EPUB book - you can read either format.
1. The PDF can be read by a PDF reader (such as the free Adobe Acrobat) when downloaded, either on desktop or tablet/mobile phone.
2. I personally have found that the EPUB book is better for reading overall and for utilising the features such as moving around the document, the links to the Table of Contents, etc, and gives a better reading experience when used on a designated Ebook reader; these are largely designed specifically to read EPUB books.
The Google Play Books app is a good one for reading EPUB books, I've found. You will need to download this or another Ebook reader to your device.
Regarding Google Play Books, this link might be useful for you: Upload PDF and EPUB files to your library Google Play Help
Amazon have also now made it possible to send EPUB books to actual Kindle devices through their "send to kindle" facility.
Amazon's "send to kindle" page explains how to do so. You must FIRST log onto your Amazon account BEFORE you can go to the following page (by typing in the address bar the address below.) For UK the page is:
There are options on that page depending upon whether you downloaded the book/file to your desktop or mobile device, including emailing the book/file to your Kindle.
NB: I hope the above helps, I have given the above information to aid based solely on my own personal experience, however I am providing the Ebooks only and technical issues or difficulties would need to be addressed to whatever device/service you decide to use.
I sincerely hope you enjoy the books. Happy reading!