Borrow books
Books don’t have 60-second trailers. Movies can show you what they are about and tell you about the characters. Before buying it, the only information you have about a book is the name, author, and cover. You usually don’t know if you will like it until you start reading it.
That is why you should start to borrow books from your local library instead of outright buying them. If you prefer E-books, you can also borrow them from an online library. When you think about it, this works as a book trailer. You can read it all and only pay a fraction of the actual amount. And in the end, if you like what you read, you can buy it and keep it.