How to draw an owl
The problem with most business and leadership advice is that it's a little like this:
How to draw an owl
The two circles aren't the point. Getting the two circles right is a good idea, but lots of people manage that part. No, the difficult part is learning to see what an owl looks like. Drawing an owl involves thousands of small decisions, each based on the answer to just one question, "what does the owl look like?" If you can't see it (in your mind, not with your eyes), you can't draw it.
There are hundreds of thousands of bullet points and rules of thumb about how to lead people, how to start and run a company, how to market, how to sell and how to do work that matters. Most of them involve drawing two circles. (HT to Stefano for the owl).