There are many web sites that offer lists of common interview questions; some include advice on how best to answer those questions. Below, we've listed some of what we consider to be the better sites, but feel free to do a web search of your own; there are many more sites out there.
Having thought through good answers to the questions you're likely to get in an interview builds your confidence and goes a long way to helping you make an effective presentation.
It's a good idea in preparing for an interview to have a short (4-6) list of key points that you want the interviewer to remember about you. These points should, for the most part, tie to the points in the summary section of your resume and responses to the key questions or issues raised by your resume, such as gaps in employment. In formulating answers to the questions you expect to get during the interview, keep these points in mind.