Bid: Bid is an expression of willingness to buy a commodity at a given price. This is an offer to buy a specific quantity of a commodity at a stated price. Bid is opposite to Ask. Bid price is the price level at which a trader is ready to buy an offered commodity.
Contract: Contract is a term of reference describing a unit of trading for a commodity future or option. At the same time contract is an agreement to buy or sell a specified commodity, detailing the amount and grade of the product and the date on which the contract will mature and become deliverable.
Offer: Offer is an indication of willingness to sell futures contract at a given price. Offer is opposite of bid, the price level of the offer may be referred to as the ask.
Par: Par refers to the standard delivery point(s) and/or quality of a commodity that is deliverable on a futures contract at contract price. Serves as a benchmark upon which to base discounts or premiums for varying quality and delivery locations. Par in bond markets refers to an index (usually 100) representing the face value of a bond.
Transaction: Transaction is an entry or liquidation of a trade.
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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.