Today beginners learn the most practical knowledge: gas fees. It isn’t money the platform charges arbitrarily; it’s the “fee” you pay the blockchain network when you make on-chain transfers, exchange coins, or interact. The busier the network, the higher the gas fee; the more complex your actions, the usually more expensive they are. Many people, the first time using an on-chain wallet, are shocked by the fee from a small transfer—actually, this is normal. Remember one saying first: the on-chain world isn’t “free,” and every action may come with a cost.