Conventions

How this guide is organized — the vocabulary used everywhere in the course, so the structure stays predictable as you move through it. (For the Java terms you'll meet in the lessons, see the Glossary.)

The hierarchy

The whole course uses one consistent hierarchy:

Course → Module → Lesson → Topic

Level	What it is	Where you see it
Course	This entire study guide (Java SE 21 / 1Z0-830).	The whole site.
Module	A major area, e.g. Java Foundations, Handling Values. Maps to an exam objective group.	A group in the sidebar + its landing page.
Lesson	A focused, teachable page inside a module.	A single page.
Topic	One concept inside a lesson.	A heading on the page.

We use these exact terms and never swap in synonyms ("section", "unit", "chapter", "part") for these levels.

Every lesson has the same shape

1. Objectives — what you'll be able to do after it.
2. The Topics — the body, one concept per heading.
3. Key Takeaways — a scannable recap to lock it in.
4. A Lesson Quiz — check yourself before moving on.

Each Module ends with a Mini-Exam covering the whole area under light exam pressure.

Quiz vocabulary

• Lesson Quiz — questions for a single lesson. Granular (e.g. separate quizzes for "Text", "Numeric", "Boolean" within a module).
• Mini-Exam — a timed, mixed quiz spanning a whole module; simulates exam pressure on that area.
• Mock Exam — (planned) a full, timed, cross-module exam simulation.