Just a little tip, not sure if this was mentioned in the course and I mentioned it or not since it appears most people have figured it out.
If your render’s shadows are coming out Jagged like this
You can go into the render settings, open up the Shadows settings and enable “Soft Shadows”. This will make a huge difference. If you want you can raise the cube size and cascade sizes as well but these wont make nearly as large of a difference.
Your final result will look like this:
