ERC20 Token Quiz
1. What is ERC20?
2. What does the `totalSupply()` function do in an ERC20 token?
3. Which of the following is NOT an ERC20 function?
4. What is a token typically used for in a dApp?
5. What is the purpose of the `transfer` function in ERC20?
6. How does a dApp user interact with an ERC20 token?
7. What is the role of the `approve` function in an ERC20 token?
8. How can a spender transfer tokens on behalf of the token owner?
9. What is a "gas fee" in the context of dApps?
10. What does the `balanceOf` function in an ERC20 token do?