1.Physical digital books
2.The normal books
3.
1)education books
2)there are many websites and applications, such as online books
3)have your personal account
2- By digital means. Because it features a wider range of currently accessible books, as well as the zoom in and out tool, and some reading apps feature audio books that provide ease when you're weak and unable to read or hold the device, Just press the voice reading that the application will read aloud.
3-
1. Currently, the ease of finding books on the internet is very large. So I think any book can be found for free on the internet, not from official sites, but pirated books placed on download sites. It is a crime but it is reality. But, the most easily found and free book type is fairy tales for children.
2. Pirated books just google what you think but official books are found in these apps: Amazon Kindle, Aldiko, Kobo Reader, Marvin, EbookDroid, etc...
3. Typically, these apps will ask you to create an account and enter your credit card information to charge for any signups that may occur in the app.