Tips to Become a better investor TL;dr

• "Pick winners" - Very useful advice by some wise man. Right next to - "buy low sell high." Impossible to pick winners all the time but easy to identify loosers.
• Experts "see" more than novices. Become an expert in a domain or industry.
• Experts use patterns to store central insights - no lists or prose - the more patterns you have, the more you can do. Patterns are a natural link to memory 
• Practice - study startup failures, ask the hard questions, be open to criticism.
• Remember there are other startups to invest. Dont invest if you are not comfortable, no need to invest because the herd is moving in that direction.