If that's beginning of learning php+js just keep on. Probably you can't expect to win the world with what you've just build, but learn as much as you can and po

If that's beginning of learning php+js just keep on. Probably you can't expect to win the world with what you've just build, but learn as much as you can and polish UX - like sorting books, pre-load next results so you get new book instantly when you press "more results" or whatever comes up to your mind. Take it as a first step, use it as a reference and go for next step and so on.