Many newspapers give a letter grade based on how well a bond fund does compared to its appropriate peers. This is a good start. What you will find is the cost is key. Thanks for the question. Treasury bonds funds are exempt from state taxes.
Corporate bonds have corporate credit risk and are fully taxable for non-retirement money.
Buy corporate bonds in retirement accounts and use funds instead of individual bonds for greater diversification. Well, that's all folks. Thanks for your excellent questions. Of those, pick the low-cost funds because they're most likely to repeat. Our thanks to Ken Volpert, The Vanguard Group and all who participated.