Cover: Cover is the purchasing futures to offset a short position (same as Short Covering or Covering Short Position). In some situation Cover is referred to as having in hand the physical commodity when a short futures sale is made, or to acquire the commodity that might be deliverable on a short sale.
High: High is the highest price of the day for a particular futures or options on futures contract.
Offset: Offset (also referred to as Liquidation, closing out and cover) is the liquidation of a purchase of futures contracts through the sale of an equal number of contracts of the same delivery month, or liquidating a short sale of futures through the purchase of an equal number of contracts of the same delivery month.
Short: Short (shorting) is the selling side of an open futures contract.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.