To become a good investor first:

1.  patient

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.