Anti-Forensics is the study of how to counter forensic methods. A skilled forensic investigator can learn the who, what, where and how of a hack with adequate knowledge, time and resources. Anti-forensics focuses on how to make the forensic investigator's job more difficult or impossible.
My first entry into this field addresses the concern of leaving BASH commands behind in the history file. You can read it here
My second article in this series addresses how to "clean" files (any forensic investigator can recover deleted files) that you don't want anyone ever to recover. Just like Hillary Clinton, we use BleachBit.