Write a clear, arguable claim (opinion statement) on a topic, distinguishing it from a fact and from an opinion no one would disagree with.
An argument essay starts with a CLAIM -- a clear opinion statement that a reasonable person could actually disagree with. "Water is wet" is a fact, and "Puppies are cute" is an opinion almost nobody argues about. But "Kids should be allowed a later bedtime on weekends" is a claim -- some people would agree, and some would push back.
A strong claim is specific and takes a real side. This week you write and sharpen your claim before building any reasons underneath it.
Mastery looks like: They write a specific, arguable claim that a reasonable person could genuinely disagree with.
Common stumbles: Writing a claim so soft or so widely agreed upon that there is no real argument to make.