Super Models
In fact, the proximate cause for posting this was so I could more effectively answer the question I frequently get from people I work with: "what should I learn next?"
If you didn't catch it, blahblahblah's post about Gabriel Weinberg's list of useful mental models is a good roadmap for exploring approaches to brainstorming, deciding, reasoning, negotiating, strategizing, managing, mitigating, and much more. Gray cells, activate!