to be a good product thinker:

1. market
   1. who are you building for?
   2. should you pivot? 
   3. what is your products core value prop?
2. ideas/features
   1. evaluating good vs bad ideas/hypotheses
   2. is this feature worth building out? does it solve a painful problem? will it help enough of our customers? 
3. execution
   1. making tradeoffs during development
   2. asking yourself - is this experience intuitive, easy, good?