One of the best things about reading with an e-reader or tablet is being able to accumulate a large library, and never having to pack it around of you move, or need another bookcase to hold it all. Cloud storage has completely revamped having books actually stored in your e-reader. I keep my online books stored in the Cloud, and then download what i want to read. Of course, the e-reader itself holds several thousand books, so even if I didn't store them online, there would be plenty of room to build a library. Kindle apps and Adobe reader are available for just about any kind of computer or tablet that you use. My preference is the Kindle app, but I think the Adobe reader works fine, too. The Kindle store is probably the best place to build your library. Not only do they have a huge amount of e-books, they also put them on sale, and even mark them down to free on some days. Suppose you want to acquire books about gardening, just as an example. You would put in "gardening" as the search, and then run the results by price, low to high. All of the currently free books will show up first, then the 99 cent ones, and so on. If you set up a one-click buying on your Amazon account, then you just choose that, and the book is instantly added to your library. Every day, the free books change; so you should check fairly often to see what new ones are free. I have gotten books that normally were $10 or more , because they were free that day. Another great place for cheap and free books is called Bookbub.com. You register at the website and fill out the information about the kinds of books that you are interested in, and you can be as broad or as specific as you choose in your selection. Bookbub will then send you emails with information about those books that are on special, and fit your catagories. You can also choose where you want to buy books from, such as Amazon, iBooks, Barnes and Noble, or most any other onkine bookstore. Adobe has what is called The Gutenburg Project, and they have put almost all of the old classical books online and you can read them for free. As an example, if you have been yearning to read (or re-read) Jules Verne's classical book, Journey to the Center of the Earth; you can find it on Gutenburg. They have lists and lists of these older books, and they are all free to read. If you are looking for a book that is no longer in print, this is also where you are likely to find it. Last, but not least, is your own online library from any large city/county library near you where you can get a library card. Once you register and get the library card, ask the librarian what you need to do to check out e-books (and audio-books). Then, download the Overdrive app for your laptop or tablet, and make an account and link it with your library account. (this sounds complicated; but it is not) Once you have this installed, you can browse the available e-books, and if they are not immediately available, you can put yourself on the list to check it out when it becomes available, just like at the regular library. They book will be checked out for 1-2 weeks, and then will simply "disappear" from your library. This is a mixed blessing. One the positive side, you will never have an overdue library book that you have to pay a fine for. The other side is that, if you have not finished the book, it disappears anyway. Then, you have to get back on the list, and wait for it to come available and check it out all over again , in order to finish the last few pages. Libraries are adding to the amount of available e-books all of the time; so the ones that are available to read online will continue to grow. There are other places online where you can find free books. If you type in the name of the book, and add "free" in the search engine; it will show any place online that has that particular book for free. I have only listed the main ones here, but there are other places to find free books if you search for them.