After writing about critical thinking recently, I received an outstanding question: how exactly might an adult who never had the opportunity for any sort of formal training in critical thinking during school learn about it now? It is never too late to learn, and few things are more important to learn than critical thinking.There are countless books on critical thinking available, and it is not always easy to find one that will be useful. Two good general ones that are often used as textbooks in introductory courses include: Others that would be good for those interested in science and religion include:Critical thinking is one of those topics on which one can find tons of great information for free online. What I am going to recommend is information available from universities. Universities are one of the primary places where education in critical thinking occurs, and the information they make available gives us at least some measure of quality control. Here are a few quick example of the sort of information one can find after a few seconds on your favorite Internet search engine:You can also find quite a bit of worthwhile information at The Critical Thinking Community . For example, here's a module called Critical Thinking in Everyday Life: 9 Strategies I hope this helps. If you find alternatives you like, let us know in the comments.