Things one should know before beginning his entrepreneurship journey?

1. Execution. Execution eats strategy for breakfast.
2. Sales. Many founders over look this aspect expecially in the initial parts.
3. Knowing what you start, what you build and what people use the product for might be really different. Keep your ears to the ground and keep iterating accordingly.
4. Team, starts with the co-founder. It's going to be years of setbacks before it looks like an overnight success. Brings the worst out of people, really important to choose the right people.

1. Risk taking ability
2. High quality execution
3. Deep market understanding
4. High quality solutions
5. Great team building ability
6. Deep resilience to setbacks
   … list goes on and on..
   but it’s something which you would need to learn on your own. Nobody can teach it .

The biggest in my experience is moving on from disappointment. It sounds obvious but not said enough. Things beyond our control broke us more than anything multiple times over the years.