To become a good investor first:
1. Patience
2. Ability to understand risk
3. Adopting techniques with careful planning and vetting before taking any action.
4. Always keep portfolio in mind otherwise it is natural to face danger. And don't put all your eggs in one basket.
5. And a skilled investor must know the latest updates about the market.
A prudent investor must adopt these approaches. Because all qualities must be present in an investor otherwise one may face losses.
And also sincerity and setting up trust to your team are some of the things one must do to be a good investor. To be a good investor is not for mere verbal speaking but your actions and activities and dealings towards your clients and you cannot be a good investor when there is nobody recommend you as one. Because you cannot praise yourself the matter what you are good in it. It is others who sees you doing well will praise you. Your good character of doing things with calm mind is okay to be a good investor.