I've long been of the opinion that one of the most egregious failings of humanity generally, and the education system specifically, is our inability to think critically. I include myself in this. Over the last decade or so I have striven to correct my errors in thinking, and to put together a far more robust epistemology than was heretofore the case. However, much of this has been done rather informally, and this book was an attempt to build a more substantial base for improving my thinking.
Since I have been working on this area for years, I don't believe myself to be a beginner, but it generally a good idea to begin with a sound foundation. As expected, there was nothing entirely new to me here, but the way the basics of logical thinking and the establishment of sound and valid argumentation was very useful. Of course, there is a lot more to learn but the diagrams here, which begin to look at very basic set theory, are very useful, as are the distinctions between validity and soundness of arguments, and the explanation of formal and informal fallacies. Fallacious reasoning is ubiquitous in discourse today. It is often used maliciously in my view, but also in error. Being able to recognize and refute such arguments as a result is an increasingly important skill.
Definitely worth picking up as a guide to starting to put such an approach together, which is something I think we should all do (at the risk of committing an is-ought fallacy).