We cant avoid losing sometimes but you can do something to minimize the losses by having a plan and be firm to follow it. Gaining big profit is not as easy as it seems (despite of having good capital) if you dont have plan on your set target price and plan b incase something went wrong.

Have your own extensive research, in that way you have your own understanding on how to deal with your investment, and dont easily believe to people who spread negative news to avoid panic selling.