What was your biggest lesson? Is there one thing you would do differently now if you could?
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I first went moderately deep on technology skills. Then on a need basis, I kind of did a BFS on all skills needs to build and run a startup.
Eventually all the skills are important.
One other thing I really put a lot of effort in is trying to put me in the shoes of other parties. E.g. if I am trying to launch an idea I try to get in the shoes of engineer, pm, design, marketing, analytics and end user. Given that I have played all of these roles to some extent, it helps me make better decisions.