It's good to have great recommendations for your college applications, which means, of course, you must ask teachers who will have good things to say about you to write for you, but...if those teachers don't write well—even if they have great things to say—it will not be helpful to your application.
What! All teachers are not good writers? Yes, it's true. So how can you assure that you get the best recommendations to send in with your college application? First, you should understand what goes into a good recommendation.