I have experienced a round of bull and bear markets, an old investor of 4 years and 5 months, having seen too many speculators rise to glory and fall, from hope to despair. Contract leverage is a tool tailor-made for speculators, and it is also where institutions harvest the most from investors. I was once a part of it, but as time goes by, through continuous self-learning, I have come to understand those big players in this market who can truly make money, the practices of institutions, and I have learned one thing: only long-term investment can change one's financial life, just like Buffett's 4-year investment method!!!