Sarah Friar, CEO of the social network Nextdoor, on lessons learned from working for Jack Dorsey at Square:

Jack told me over and over again is, don’t be afraid to fail in public. It’s very wise advice, particularly for women and particularly given my background. There was always this sense of having to be perfect, be the best, be the A student and the good girl in school. Failing, it’s one of the things I find hardest. But when you get things wrong and can be frank about it in front of other people, it gives you strength.