First Principles Thinking: Break problems down to their fundamental truths, then rebuild from the ground up.

Ask:

1. Is this a reversible decision?
2. What would I do if I had 10x more capital?
3. What is the opportunity cost (what am I not doing by saying yes to this)?

Next time you’re stuck, run this checklist. Most "Yeses" turn into "Nos" very quickly when you look at the opportunity cost.