Don't just draw an oval. Write the actor, precondition, main success scenario, and postcondition.
Do not let the PDF sit on your hard drive. Open it to Chapter 5 (Use Case Modeling), pick a small personal project (e.g., a Library Manager or a To-Do App), and draw your first diagram by hand. Then, refine it using a free tool like Draw.io or Lucidchart. Don't just draw an oval
Ask: Which class validates data? Which class saves to the database? Which class handles the UI? main success scenario
Take one scenario from the use case (e.g., "Student enrolls in course") and map the message flow between 3-5 objects. pick a small personal project (e.g.
List all nouns from the use case description (e.g., "Student," "Enrollment," "Transcript"). Filter out irrelevant ones.