> You become an expert on a topic by writing well on it because you're forced to fill in all the gaps as you go, and then people give you the credit because you

> You become an expert on a topic by writing well on it because you're forced to fill in all the gaps as you go, and then people give you the credit because you have a book. For me, teaching had a similar effect (and, to a lesser extent, blogging). I worked in IT at a .edu for ~8 years and was approached to teach a few courses as an adjunct professor, which I did for ~3 years. I think I learnt much, much more while I was teaching than my students ever learned from me.