Computer Science
Grade 8
20 min
Repositories and Commits
Repositories and Commits
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Define what a repository is in the context of version control.
Explain the purpose of a commit and what it represents as a project snapshot.
Differentiate between a local repository and a remote repository.
Create a new local repository for a project.
Perform a commit to save changes with a descriptive message.
Describe the three states of a file in Git: modified, staged, and committed.
Explain why clear commit messages are important for collaboration.
Ever wished you could go back to an older version of your school project after making a mistake? 💾 What if you had a time machine for your code?
In this lesson, you'll learn about repositories (like a project's magic folder) and commits (like saving checkpoints in a video game). This is a supe...
2
Key Concepts & Vocabulary
TermDefinitionExample
Repository (Repo)A digital folder or storage space where your project lives. It tracks all the files and the history of every change made to them.Imagine a project to build a website. The repository would be a folder containing all the HTML, CSS, and JavaScript files, plus a hidden folder (.git) that acts like a history book for every change.
CommitA snapshot of your files at a specific point in time. It's like saving your progress in a game, creating a permanent checkpoint you can return to.After finishing the navigation bar for your website, you make a commit with the message "Create responsive navigation bar." This saves the exact state of all your files at that moment.
Working DirectoryThe folder on your computer where you are currently working on...
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Core Syntax & Patterns
The Three-Step Save Pattern (Add & Commit)
git add <file> -> git commit -m "Your message"
This is the fundamental workflow for saving your work. First, you use `git add` to move your changes from the Working Directory to the Staging Area. Then, you use `git commit` to take a permanent snapshot of the Staging Area and save it to the repository's history with a message.
The Status Check Pattern
git status
Use this command frequently to see the current state of your project. It tells you which files have been modified, which files are staged, and which files are not being tracked by Git at all. It's your 'mission control' for understanding what's happening.
The History View Pattern
git log
Use this command to see the his...
4 more steps in this tutorial
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Challenging
You are fixing a small typo in your `README.md` file. At the same time, you have finished coding a large new user profile feature in `profile.js` and `profile.css`. According to the "Common Pitfalls" section, what is the best way to save these changes?
A.Delete the typo fix because the new feature is more important
B.Commit everything together with the message "Update files"
C.Commit the new feature first, then add the typo fix to the same commit later
D.Commit the typo fix first with a message like "Fix typo in README", then commit the new feature with a message like "Add user profile feature"
Challenging
A student creates a project folder `my-game` and correctly runs `git init`. Later, they create a subfolder `my-game/characters` and accidentally run `git init` inside it as well. What problem does this "repo inside another repo" cause?
A.It will automatically merge the two repositories into one
B.It will delete all the files in the parent `my-game` repository
C.It will prevent any new files from being added to the `characters` folder
D.It creates a nested, separate history for the `characters` folder, which can cause confusion and conflicts when tracking changes for the whole project
Challenging
The tutorial compares a commit to "saving your progress in a game." Extending this analogy, what is the best description of the Staging Area?
A.The game's instruction manual
B.Selecting which specific achievements and inventory items you want to include in your next "save point," while leaving other temporary items out
C.The final boss battle that you can't return from
D.The list of all previous save points you have created
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