Theoretically, the prices of futures and spot will coincide in the current month, so if you really want to see the spot through futures, look at the current month.

Due to different delivery months, futures have corresponding codes. Shanghai Aluminum 100 1 refers to aluminum futures traded in Shanghai, and the delivery month is 20 10 1.

As for the last question, because London Nickel belongs to the international nature, it is really possible to be ahead or behind, so it is not good to give you a final conclusion.