Honestly it really depends on what the topics are but you would start with the attention grabber, then compare it to your subject, then you would say if you were writing about your beliefs on pollen, I believe that pollen is the world worst allergy because and then put the justifications after.
A Fashion trend that is popular are crop tops. I dislike the trend because it is immodest. That's why I think it is popular because girls like showing their bodies. I think it will last for a couple months even to years.
