Recognizing logical fallacies is not only an indispensable tool in the skeptic’s toolset, but it is also very useful in day-to-day discussions/debates for recognizing faulty arguments:
In logic and rhetoric, a fallacy is usually an improper argumentation in reasoning often resulting in a misconception or presumption. Literally, a fallacy is “an error in reasoning that renders an argument logically invalid”. By accident or design, fallacies may exploit emotional triggers in the listener or participant (appeal to emotion), or take advantage of social relationships between people (e.g. argument from authority). Fallacious arguments are often structured using rhetorical patterns that obscure any logical argument.
Though an argument is not “logically valid”, it is not necessarily the case that the conclusion is incorrect. It simply means that the conclusion cannot be arrived at using that argument. (…)
The nice poster above is from yet another website that explains the most common logical fallacies. Other excellent sites with information on, and explanations of, logical fallacies are this one, this one, and finally this one.
It may take several readings of those sites to become familiar with the specifics of these fallacies, but the result is being able to recognize them in discussions when they occur, as well as knowing how to counter them, if needed.