Common types of transactions in blockchain transactions include limit orders, market orders, stop-loss orders, and trailing stop-loss orders. Limit orders are suitable for those who want to buy or sell at a specific price; market orders are suitable for those who prioritize the speed of execution, which carries slightly higher risk; stop-loss orders are a good tool for controlling losses. Trailing stop-loss is suitable for locking in profits during an uptrend. Beginners are advised to start with limit orders, which are relatively safe and can help in better understanding market conditions. Different transaction types are suitable for different strategies, and understanding their mechanisms is the first step to entering trading.