My first trading principle

My first trading principle is that my father left me a message. “Failure is the mother of success. Who is the father of success”?
My father and I chose a stock together. The price of this stock has fluctuated. Occasionally it's like a roller coaster. I wanted to make money by selling at a high price; at a low price, I wanted to sell for 100 even more.
As a result, after a few years, this stock became more and more valuable as the company's performance grew. Of course, stock prices also increased in value. Only later did my father tell me the answer.
“Son! A successful father is — never give up”!
“Dad! Thank you”.
I'll keep that in mind.