Being around people who know things I don't. My first job I was the only developer (until I got to hire a junior), and learned a lot by trial and error. But I

Being around people who know things I don't. My first job I was the only developer (until I got to hire a junior), and learned a lot by trial and error. But I quickly made a massive leap forward when I moved to a team of a dozen developers, all of whom had knowledge, skills, experiences or ideas I could learn from.