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JWC3
There used to be a site that went into not only how the fallacies were fallacies, but also gave ways of moving past the fallacy. Such as if someone brings in a red herring, say something like "what does [insert their red herring] have to do with [current point/argument]?" or if they do a strawman, saying something like "i wasn't arguing [insert strawman], I was arguing [point]." (These were poor examples from my poor memory of the details.)
Unfortunately, the link is on an older pc which i cant access now :(
Also, regarding the astrology and logic thing, I used to have a book titled "Thinking Critically About New Age Ideas". It actually helped me get a grasp of some of the common errors involved in New Age writings, while not being anti-new age ideas. I found its presentation better than the extreme skeptic presentations, because it wasn't completely against new age ideas...it just helped encourage the reader to put more thought into what they read from new age writings.
And finally, regarding the fun of learning about logic, I really enjoyed learning about symbolic logic. Unfortunately, i didnt get past sentential logic due to getting distracted by other interests.