It's dangerous to reach too far for yield, which is why you should avoid this one stock. But sometimes a high yield is an opportunity, too. If you're trying to live off the income your portfolio generates, it makes sense that you'd want to own high-yield stocks. But not all high-yield stocks are of the same quality. That's why you should probably avoid Annaly Capital Management (NLY 1.27%). But sometimes you can find real gems when you focus on yield, which is why you might want to buy TorontoDominion Bank ...