Wikipedia articles are written by thousands of anonymous people who edit each
other's contributions. These articles tend to be short and explain the broad
spectrum of each subject. By following links to related subjects, one can spend
hours and hours on the giant wikipedia web site!
This is a broad overview of all the different subjects in logic. You need
some knowledge of logic to understand what they're talking about in this
Critical thinking is popular term that is related to informal logic. Classes
in critical thinking are often taught in college to help students make good
decisions and become less gullible.
The Fallacy Zoo is a site on all the traditional fallacies. A man who wants
to increase general understanding of fallacies set up this site. He was
tired of explaining the fallacies to people over the
Ministries Summit Ministries' page on Critical Thinking introduces the
subject from the point-of-view of a Christian world-view. It teaches some
major concepts and the most important logical fallacies.