You may observe the same requirements with different designs. They may all work, then which design is better and why. Let$$s focus on design subtlety.

From the requirements on slide $11$ of the module $3$ lectures, I assume that you created your ERD. You may have questions about the requirements from a training company. The requirements are not complete which is common in real life.

What are your questions to the manager of the training company; and what are your reasonable assumptions to support your design that may better support business operations?

You also can check your design against a more generic and simplified University ERD on slide $36$ of the lectures.

Try to understand the relationships between STUDENT $$ ENROLLMENT $$ OFFERING; FACULTY $$ OFFERING $$ COURSE entities. Do you agree with them? Do you have other designs to specify the relationships between STUDENT $$ ENROLLMENT $$ OFFERING; FACULTY $$ OFFERING $$ COURSE entities?