I need to summarize the main messages of the book "to kill a mockingbird"what is the message the author wants the readers to grasp? what in the authors life experience might have been the catalyst for this story? what is the climax of this story ?

Hey, I think you might have to ask these questions separately. In any case, I'll take your first one. Basically you are asking about theme. There are a few themes in "To Kill a Mockingbird". I think the main one is doing the right thing in the face of great opposition. Atticus knew that if he didn't take the Tom Robinson case, he could never tell Scout and Jem what to do again. Sometimes people need to do the right thing even if it costs them personally. Atticus knew the town's bigotry but felt their ignorance, perhaps, could be overcome. Atticus also stated that he knew he probably would not win the trial but trying to defend an innocent man was just as important as winning. AS I said before, there are more themes but I always found that one the most compelling.