Given below is a link of how mutation happens, DNA Repair and the cause for cancer. Though technical terms are in plenty, knowledge of this can make you ready what to expect
http://www.kean.edu/~jfasick/docs/Cell%20Biology/chapt14_lecture_Edited%20%5BCompatibility%20Mode%5D.pdf
http://www.kean.edu/~jfasick/docs/Cell%20Biology/chapt14_lecture_Edited%20%5BCompatibility%20Mode%5D.pdf