Duke / Coursera has a free course on critical thinking. It can even lead to a certificate if you take a couple other classes, but by itself it's a great intro to critical thinking and proper arguments, as well as detect improper arguments being used on you.
https://class.coursera.org/thinkagain-003/lecture
Class is free, though they're already on Week 8, so you'll have a bit of catching up to do!
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https://class.coursera.org/thinkagain-003/lecture
Class is free, though they're already on Week 8, so you'll have a bit of catching up to do!
