Reading widely, and reading often, are essential habits to develop if you want to be a writer.
It's through reading that you really learn how writing works. If you've never read a book, you have no chance at all of writing one that can stand up for itself. Through reading you learn to understand grammar, punctuation, characterisation, dialogue, exposition—all the building-blocks of writing. And yet many people who want to write hardly read at all.
When you read, consider what you think the writer did well, and what you'd have done differently. Notice how the work is constructed, how the characters are exposed, and how the story is built. Think about the choices that the writer made, and how different choices would have resulted in a different book. Then go back and think about your own work, and how those points apply to it.