So if China slow down, will the world be affected?
It's already happening. Just look at what Apple and Tesla are doing in China. They are aggressively reducing their prices in order to slow the drop in demand. The world economy growth will slow down as a whole but it will not be even in all markets. Just avoid the China companies and you will be fine. Buying the dip or catching the falling knife? If the stock is 20% exposed to China then it might be buying the dip but those stock with 80% exposure to China then its catching the falling knife.