Working at places that hire really good developers (not trying to be immodest). I languished in one place for many years and when I left, I learned a whole lot

Working at places that hire really good developers (not trying to be immodest). I languished in one place for many years and when I left, I learned a whole lot in just a couple short months. There's a difference between "knowing of" a practice and working among a team that lives and breathes a set of practices every day.