As a junior manager, one of the biggest challenges I faced was not focusing on what was important, but rather what was urgent. This often resulted in feelings of frustration, negativity towards others, and low self-esteem. So, I decided to find answers to the question, "what does it take to manage effectively?" and I found the best answers in Peter Drucker's 1967 book "The Effective Executive". The first piece of advice he offered was to "Know Thy Time". This is something I would highly recommend to any startup founder, especially since time is a crucial asset in disrupting the market.