My first question is why you want to solve only hard problems? I understand there are a couple of motivation 1. Training yourself to solve hard problem 2. It op

My first question is why you want to solve only hard problems? I understand there are a couple of motivation 1. Training yourself to solve hard problem 2. It open doors I would think it's more valuable to figure out valuable opportunities (this might involve some hard problems or other combination of market forces). So for me hard problem is figuring out valuable opportunities before other people notice.