Who could not want not just any guide to making smart decisions, but the ultimate guide? That’s a big promise, but there is some substance to what is delivered. The post itself briskly covers categories of bad decisions before moving on to extensive sets of links to material on thinking in general and decision making in particular. I can’t imagined anyone wanting to work through all of that systematically, but if you need a way of homing in on an aspect of or approach to the subject, this could be a very good place to start.