How to lead a happy and healthy life?

This problem is very big, but it is very extensive. If you want to live a healthy and happy life, you must know what health is and what happiness is. First of all, we must have a correct outlook on life and the world. The value must be correct. In other words, in layman's terms, it is necessary to have a correct opinion. For example, if you believe in cause and effect, you think that doing good is good and doing evil is evil. I think it is happy and beneficial to help others. If you think it is right to satisfy your own selfish desires, you must do whatever it takes for your own benefit, and then at the expense of others. Therefore, we must first have a positive view (of course, we believe that cause and effect are correct), and then we can benefit from it, get happiness from it, and obviously feel that we are getting better. This is happiness and health.