One of the best advices on success from Warren Buffett:
Play the long game.
To make money, an investor shouldn't buy a stock with the sole intention of selling, Buffett believes. You're in it for the long game. "Our favorite holding period is forever," Buffett first said in the 1988 shareholders' letter.
Buffett only buys stocks of companies he understands and likes, and thinks selling should be done when you need the money and not when you believe it is a strategic jumping off point.