This is an easy-to-understand explanation of how Klaytn works compared to the existing popular coins, Bitcoin and Ethereum. I think anyone who knows even a little about the principles of existing blockchains will be able to easily understand the operating principles of Klaytn. It was good to be able to intuitively confirm how blocks are created and transactions are made through IDE, Wallet, Scope, etc. based on the theory. And through the process of creating a Bapp and actually utilizing it, I was able to experience once again how fast Klaytn's transaction proof is made, and I was able to learn more enjoyably. I think this is a great lecture that makes me want to create other Bapps using Klaytn. I am grateful that I can take this lecture for free.