Coupon Rate: coupon rate is stated as the yearly percentage interest given and issued out by a bond

Coupon Rate:
coupon rate is stated as the yearly percentage interest given and issued out by a bond issuer during the life of such bond at face or nominal value, which proves to be of most importance due to its measurements in terms of income generation abilities.
Yield to Maturity (YTM)
YTM is the return an investor may be presumed to receive if a bond is kept to maturity. It calculates the present market value, coupon, and time until a bond matures.
Credit Rating:
Bonds also receive ratings from outside agencies such as Moody's, S&P or Fitch. The risk of defaults is higher for lower-rated bonds. As a result, investment grade bonds are considered relatively risk-free but junk bonds or high-yielding are riskier with greater returns.