This is more confusing than helpful. Why does closing have this huge differences? How to trade these??

This is more confusing than helpful. Why does closing have this huge differences? How to trade these??

It is indeed confusing. Closing can have huge differences in 4 situations - either big institutions want to acquire / sell an asset in delivery , or someone wants the closing price to be above / below a specific strike price, some last minute news , geopolitical events etc, or some stock has so low liquidity that even a small order causes big changes in closing price.
These are difficult to trade for the average retail trader , especially on expiry. But small investors who trade in delivery can sometimes get better prices in closing if they are lucky.