Not to kill or destroy humans in any manner.
Be nice to people - is one of the greatest mitzvos & keys to success in life. Wealth is generally also a result of freindships. The same goes for good health.
Instead of harming people , assist them & your business will also prosper. The same word for wealth - osher , has another meaning eser which means give a tenth to charity. The Talmud says when you give a tenth Hashem will cause you to prosper.
One of the reasons for how this works is that when you look to help others , Hashem causes you to be noticed by others who happen to need to do business with you !
There is a significant lesson from the first murder in history. When Kayin killed Hevel one of his thoughts may have been , now I will acquire ( the meaning of his name ) more of the world. But Hashem sends him into exile to teach him - wealth comes from interacting & cooperating with many others , not by destroying them.
Now may be a good time for a gem of Torah study.