Can someone give me a good website so that I can answer all the questions of the book "To Kill a Mockingbird"?
You're at the right website. At eNotes, you can submit questions in the question and answer section, or you can go do a search under the title of the book. You will be able to find overall book summaries, individual chapter summaries, discussions of theme, historical context, information on the author herself, and many critical analyses of the book, its writing, and its themes. I have provided a link below that contains a link to an index that will lead you to all of these things, and you can navigate yourself. The other link I provded was to a summary and discussion of each chapter. The last link I provided is to a discussion of themes in the book; often, teachers use theme as a prompt for essay questions. And of course, if you haven't read the book yet, I highly recommend that you do. "To Kill a Mockingbird" is one of the best books out there; it's entertaining, touching, uplifting, and a great tale of friendship, humanity, and family.
I hope that this helps; eNotes is a great resource for you to use, and I hope that you find it useful.
The one I use with my class is a website (written by students themselves) to help with general comprehension and vocabulary, especially idioms and historical allusions. I give my students a head start having them scan the information from the first three chapters with a task sheet to complete, using the site below. That way once they actually begin reading, they don't have to stop at every other line to look something up.
Of course, no reference is as good as the book itself! It's one thing to receive a post card from an exotic, faraway place and another to go there on vacation!