Basic case study answers these questions:
The Project
What was the problem and what was the goal?
Who were the main stakeholders?
What was your role?
What constraints were you working with?
What was your timeline?
Your UX process:
How did you make decisions based on user research?
How did you collaborate with other teams, designers, and PMs to learn as much as possible about user needs?
Your creative process:
How did you iterate on copy"?
Why did you choose the words you did?
What were other explorations that didn’t succeed?
How did you make final decisions on copy?
The final product and result:
You don’t need to share confidential information, but we need to know how you measured success. Did you use analytics, testimonials, reviews?
How long did it take?
What were the main lessons learned?
Don’t feel like you need to create long-winded copy for a case study. Make it easy to read and scan, using subheads and bullet points.