Logic is the study of how to reason well, how to correctly draw inferences from our starting premises. Though logic is employed nearly everywhere, including politics, advertising, media, work, and everyday life, many people do not understand how logical reasoning works and frequently make mistakes in such reasoning. This section will help you to understand logic better and help to increase your skills in constructing and evaluating arguments.
Introductory logic
Formal Logical Fallacies
Informal Logical Fallacies
Introduction to informal logical fallacies
Additional Resources
Logic & Fallacies: a readable introductory article covering the basics of logical reasoning and logical fallacies
The Nikor Project: an excellent resource for logical fallacies
Logical Fallacies: comprehensive catalogue of brief introductions to many logical fallacies
Logically Fallacious: one of the best internet resources for logical fallacies
The Logical Place: a concise and clear discussion of many common fallacies, along with relevant examples
Fallacy Files: a collection of materials related to logical fallacies, including definitions and real world examples
Changing Minds: a useful website with materials related to rationality and critical thinking, also with considerable coverage of logical fallacies
Wikipedia List of Logical Fallacies: a very comprehensive list and an indispensable resource
Introduction to Logic: useful course materials for a university subject covering logic and reasoning
Toolkit for Thinking: contains an interesting visual catagorisation of logical fallacies along with more information about each
Philosophy Pages Logic: though somewhat hard to navigate, this site contains much useful material covering the more advanced philosophical aspects of logic and reasoning
Introduction to Logic: course materials from Oxford covering a course in formal logic (advanced)
Introduction to Logic: online materials relating to formal logic and construction of proofs (advanced)
James Fodor 