If you consider yourself a rational person, in particular a rationalist, I highly recommend you learn formal logic.
If you've never learned it formally, you need to take a hard look at how you think logic works, and how it actually does. Knowing lists of logical fallacies is not enough. You must be able to distinguish between valid and sound arguments. You must understand that a fallacy in an argument does not prove the conclusion false. You must understand that debates are not how truth is determined.
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