An accident is an incident that has turned nasty. It is an incident with (fatal) consequences. Pilots seem to remember accidents quite well (especially their own), but somehow tend to neglect incidents. Usually because they get away with the latter.
That is a missed opportunity for improving your piloting skills, since incidents tend to be the herald of accidents. Accident analysis often reveals that there have been multiple incidents before the accident (finally) occurred. Often concluding that the accident could have been prevented, had the incident(s) been heeded.
I see no difference between accidents and incidents other than the outcome. So, I refer you to the incidents section for further reading. I also suggest you have a look at the sections on risk and good piloting.