Pivot the life

Solidity supports two types of callback functions, namely receive() and fallback(), primarily used for the following scenarios: Receiving $ETH and handling function calls that do not exist in the contract.

call, staticcall, and delegatecall are all low-level ways to call functions in another contract. They all allow adjusting the gas limit (compared to transfer and send, which have a fixed limit of 2300 gas) and do not throw exceptions when a call error occurs; instead, they return false.