1, "main contract" refers to the contract with the largest position and turnover in a month. This is the case with the agreed binding. When the position really moves up, there are often two contracts with large trading volume. And these two contracts sometimes "go up" or "go down". I often use this to trade on different contracts. In addition, cross-month arbitrage can also be carried out. The reason why people trade in the main contract is because the main contract has a large turnover, easy to clinch a deal, large fluctuation and easy to make a profit. Moreover, the main contract often differs from the current month by several months, which can be long-term or short-term. So there are main contracts and non-main contracts.
2. The "master contract" will change with the passage of time. After one delivery month, the main contract is transferred to the next delivery month. We will also move the warehouse in operation accordingly. Switch to the new main contract for operation. Therefore, the main contract does not refer to which contract, but should be understood as: "the most active contract."
3. One is the index compilation method, such as Wenhua Finance, which is the price calculated by weighted average of the prices of various contracts with the volume as the weight. This method is also a way to record historical prices. In my personal experience, this method is more scientific. I have a trading rule: analyze with the index and trade with the main force. That is, analyze the trend, look at the index, operate, open the main position, set the stop loss and so on.
Futures technical indicators: MACD is developed according to the advantage that the moving average is easy to grasp the direction of trend change. It uses two different speed indicators smma (one is a fast-changing short-term moving average and the other is a slow-changing long-term moving average) to calculate the difference (DIF) between them as the basis for judging the market, and then calculates the 9-day smma of its DIF, that is, MACD line. MACD actually uses the signs of convergence and separation of fast and slow moving averages to judge the timing and signal of buying and selling.