Ribbon hedging: one-on-one hedging ... For example, if you deliver crude oil every month for the next three months, you will buy futures with maturities of 1 month, 2 months and 3 months to hedge.

Stack hedging: rolling hedging. Calculate the total amount of crude oil needed for three months, buy futures with a maturity of 1 month, and roll after the maturity, which is called rolling.

The transaction cost of stack hedging is low, but there is basis risk due to different maturities.