2. The liquidity of futures contracts depends on the trading volume. The contract in the month with the largest turnover (called "main contract") can be realized in a short time, so it is said that liquidity is good. On the contrary, a monthly contract with a small volume, whether it is opening or closing, is not so easy, so it is called poor liquidity.
3. Contracts with good liquidity tend to be more continuous.
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Friendly reminder: unless you do futures arbitrage, please try not to participate in contracts with small trading volume.