Do you have good sound reasons or merely reasons that sound good? In this study of over 60 informal logical fallacies we will discover common errors in logic and how they affect our beliefs and opinions. They include: ARGUMENT AD HOMINEM, HASTY GENERALIZATION, THE SLIPPERY SLOPE, APPEAL TO PITY, SPECIAL PLEADING, BEGGING THE QUESTION, LOADED QUESTIONS, THE IS-OUGHT FALLACY, CHRONOLOGICAL SNOBBERY, CLICHÉ THINKING, HYPOTHESIS CONTRARY TO FACT, WISHFUL THINKING, THE GOLDEN MEAN, APPEAL TO TRADITION. THE RED HERRING, ARGUMENT TO THE FUTURE and many more. Digital study notes included.