What a file is
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Coding Foundations · Lesson 4 of 13
Files, Folders, and File Extensions
Learn how files, folders, and familiar file endings help beginner projects feel clearer and less intimidating.
Free
5 practice exercises
1 homework item
What you will learn
- Explain what files and folders are in simple terms.
- Recognize what a file extension helps you understand.
- Identify common beginner file endings such as .html, .css, .js, and .py.
- Understand why project organization reduces confusion.
Lesson shape
15 minute lesson with 6 sections, 5 exercises, 11 checkpoint questions, and 1 homework submission.
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Lesson outline
What this lesson includes
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What a folder is
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Why project organization matters
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What a file extension means
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Common examples like .html, .css, .js, and .py
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What to remember before moving to lesson 5
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Homework
Assignments attached to this lesson
File upload
Open homework
Upload your file-organization checklist
Upload a short note or checklist showing how you would organize beginner project files.
Keep moving
Finish this lesson, then move forward without losing your place.
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