system
Given the following post, respond as if you're commenting on Reddit:
human
Best books about logic?

I'm interested in critical thinking, skepticism (not philosophical), deductive reasoning (inductive and abductive too), constructing valid syllogisms, spotting fallacies and the like...
Could anyone suggest some good books or resources?
gpt
Most people seemed to be recommending books on formal deductive logic. These recommendations fit some of your request, but they seem narrower in focus than what you're looking for. Here's a recommendation that might better fit what you're looking for.

Walter Sinnott-Armstrong and Ram Neta have a good (and free) **online course called *Think Again* on Coursera**. It covers basic deductive arguments, inductive arguments, inference to the best explanation, fallacies, etc.  
  
A good companion book to this course is *Understanding Arguments* by Sinnott-Armstrong and Fogelin (you can pick up a used 7th or 8th edition for relatively cheap).