Minh Hi Azmi, welcome to Goodreads. Only a few books offer e-books version, usually old classics like Pride and Prejudice or Jane Eyre. You can click on the word Explore on the menu above and choose "E-books." Other modern books like Harry potter, Game of Thrones, or YA lits do not give you ebooks, you have to buy them. Goodreads is more of a site where you write review about books, add them to your shelves, and browse other people's reviews. If you have any question, inbox me.