It's great you're being so resourceful in finding information
Case Studies are for sure very important for showing your process. It's very much going back to the iceberg scenario, in that our projects are just the tip, but what potential employers are looking for is how you got to that result, what your trial and error process was and why.
This is a great site to see examples of how others will write their case studies. I use this as a reference a lot. casestudy.club
Also, if you are interested, here are my case studies if you wish to read? I am a junior myself, I have finished bootcamp and I am in a similar position to you. Feel free to give me feedback! When you have yours done, I'd love to reciprocate by reading yours over too!
I hope this has helped!