What are some of the things Justin Kan learned as a startup founder and investor?

Infinite learning. A lot of self-awareness, the things he is good and bad at. For example, he is very good at pitching, which is a pretty critical skill as an entrepreneur. He has a good strategic mind. Meanwhile, he is also bad at a lot of other things. He thought he was good at some of those things in the past, but has learned that it's better to partner with people who can match you on missing skills and do those really well.