In the era of the 4th Industrial Revolution, big data is the most important beause it is the crux of AI and platforms. Those who have big data can get wealth. The future will be dominated by AI. We should teach our children 'coding'. Coding is a first step they have to take toward big data. If you know big data, you'll get paid more. And you can get a good job, Among my juniors, there are a big data professor in KAIST. He has insight into the future, and he is good at reading the latest trends. Also, he is so interested in startup. And he has been invested in five to ten startup firms every year. Amazingly, he established a startup company at the age of 28. And he "exited" it when he was 34 years old. At the age of 35, he became a professor of KAIST. Besides, knowing big data and AI, he has been earning lots of money. In conclusion, Those who can lead trends can enjoy wealth!