I think one of the most important lessons I took from the coding boot camp I went to was the value of the MVP. There, the first step was to deploy an index.html with "hello" before doing anything else, before even npm init. Then, get your framework running with another hello. Then, the barest functionality possible - if we were building a GitHub analysis thing, make the frontend capable of listing repos before building the server that did analysis on those repos (or vis versa).

Through a couple group projects I refined the concept of KISS and feature prioritizing, siloing, and escalation.