Commissions in crypto are an important factor when choosing a platform and strategy. There are several types of commissions: for transactions on the network (gas in Ethereum), for trading on exchanges, for withdrawing funds, and even for depositing (on some centralized platforms). In decentralized protocols like Uniswap, commissions depend on network congestion. Sometimes a transaction can cost tens of dollars. On centralized exchanges, commissions are usually fixed and lower, but it's important to consider hidden costs when exchanging assets. Plan your actions in advance: group operations, track commissions, and choose the network with the least load to save.