How can i read a book on line
Google books has a bunch of excerpts. If the book was made over 50 yrs ago, sometimes the copyright will allow it to be "public property" in a way and you can access the whole book free.
You can't, at least not for free, that would defeat the purpose of them being sold.
Several libraries will let you check out books to read on line.
look it up
There are some apps. One called watpad.