The price column refers to the last price that the bond traded at. The yld or yield column refers to the rate of return that the bondholder will ultimately receive. It is essentially the market interest rate that the bond provides to it's holder. The change column refers to the change in the price of the bond since the price at the last valuation date. Other items that you may encounter include . . .
Ratings differ somewhat based on the company providing the rating.
Refers to timing of interest payments. Most bonds pay interest semiannually. Date at which the bondholder is no longer entitled to receive the latest interest payment.