This is such a huge topic that any answer shorter than a book will be inadequate. But I've found two things to be helpful for learning "how to think." 1. Study philosophy. While defining philosophy precisely is difficult/impossible, it's essentially the study of thought. But, it's very important to study philosophies outside of your normal frame of reference. Read books from different eras, languages, countries, and…
> Trying to understand how an intelligent person could come to an opposite conclusion will improve your thinking ability. I don't think you can term flat-earthers intelligent. That's a dangerously low bar. > A good method for this is: pick an idea that you are 100% sure is true. Not "the Earth is round" but "X value is good." Then search for people who disagree. This is a neat trick (does it have name?), but the true…
Well if they aren't intelligent, wouldn't understanding their reasoning be easier to understand? I at least don't associate simpletons with convoluted logic.