We usually have to invest in three things: real estate, regular stocks, startup stocks. Generally, people invest in stocks. Recently, as the rate of vaccination is increasing, people are investing in stocks again. Nevertheless, due to "Delta Variant", "th Global Pandemic" is rising as a new concern globally. If it spreads, the global economy will stumble into another crisis. As the Corona virus is continuing to spread, uncertainties are growing. at this juncture, investment in stocks can be a golden opportuniry for people. With Corona causing stock prices to fall, we can buy stocks at low price. However, we have to know the current trends. Particularly, in the era of the 4th Industrial Revolution, we should read AI, platform business, bio healthcare, data solution, metaverse, delivery services. pintech, to name a few. To know this, we must study a lot! The world is changing rapidly. We have to catch up with the pace of the change. The most three important things of the change : First "speed". "Second, the impact of stgructure" Third, "scope". The bottom line is that we have to focus on the three things!