In the blockchain world, every transaction execution requires the consumption of computational resources, and this resource cost is called Gas. Imagine you need to complete a series of complex operations—such as extracting liquidity from a DeFi protocol, swapping tokens, and then transferring to a yield farming project. These steps may seem simple, but on-chain execution involves interactions with multiple smart contracts, incurring significant Gas fees.

This is why Gas Limit is so crucial. It is equivalent to setting a "budget cap" for this transaction. Setting it too low may cause the transaction to fail midway, and the base fees you paid will be lost. Setting it too high, although the excess will be refunded at the end, the initial redundant reservation and market volatility's uncertainty can still cause unease.

Especially when handling complex programming calls—transactions involving multiple steps and protocol interactions—accurately calculating the Gas Limit is like carefully planning fuel supply for a long voyage. You need to ensure the task is completed smoothly while avoiding unnecessary costs. This requires a sufficient understanding of on-chain operations to find a balance between safety and efficiency. For users who frequently participate in DeFi interactions, mastering this skill can significantly reduce transaction costs and failure risks.