Watch a founder build their second company and the difference is striking. The idea is not obviously better. The execution is calmer, faster, and far less wasteful.
Second-time founders waste less time on things that do not matter. They have already learned which fires are real and which burn out on their own.
Most of the lessons are subtraction, not addition: what to skip, what to ignore, what to say no to.
Borrowing the Lesson Early
First-time founders can borrow some of this by talking to people one step ahead.
The cheapest experience is the kind you learn from someone else's scars.