Cloning, Forking, and Merging Repositories on GitHub: A Beginner’s Guide
This comprehensive guide walks you through the essential GitHub operations of cloning, forking, and merging repositories. Whether you’re new to version control or looking to solidify your understanding of GitHub workflows, this tutorial will equip you with the fundamental skills needed to collaborate effectively on coding projects.
Understanding GitHub Repositories
GitHub repositories serve as central storage locations for projects, containing all files, folders, and the complete history of changes. Before diving into specific operations, it’s important to understand the difference between remote repositories (hosted on GitHub) and local repositories (on your computer). Working with GitHub typically involves creating a local copy of a repository through cloning or forking, making changes, and then integrating those changes through merging.
Remote vs. Local Repositories
Repositories on GitHub are remote repositories. To work with them on your computer, you need to create local copies, which you can do by cloning or forking1. The main differences are:
Remote repositories: Hosted on GitHub’s servers and accessible to collaborators
Local repositories: Exist on your computer, allowing you to work offline and test changes before sharing
Cloning Repositories
Cloning creates a local copy of a repository on your computer. This is the most direct way to start working with an existing project.
What is Cloning?
When you clone a repository, you download a complete copy of the repository, including all files and commit history. This creates a connection to the original repository, allowing you to push changes back if you have write permissions.
How to Clone Using HTTPS
Find the Repository to Clone
Navigate to the GitHub repository you want to clone
Click the green “Code” button above the files list
Select the HTTPS option to get the repository URL
Clone the Repository Using Git
Open your terminal or command prompt
Navigate to the directory where you want to store the repository
Type the following command:
Press Enter to begin cloning
Authenticate if Necessary
For private repositories, you’ll need to authenticate
GitHub no longer accepts password authentication for HTTPS
Use a Personal Access Token (PAT) instead, which you can generate in GitHub Settings → Developer settings → Personal access tokens
Start Working with the Cloned Repository
Navigate to the cloned repository directory using:
Now you can view, edit, and work with the files
Cloning Using GitHub Desktop
If you prefer a graphical interface:
In GitHub Desktop, click “File” → “Clone Repository”
Select the repository source:
Choose from your GitHub repositories
Enter a URL for any repository
Browse for a local repository
Choose the local path where you want to store the repository
Click “Clone” to finalize the process
Forking Repositories
Forking is creating a personal copy of someone else’s repository in your GitHub account, which allows you to freely experiment with changes without affecting the original project.
When to Fork Instead of Clone
You should fork a repository when:
You don’t have write access to the original repository
You want to contribute to an open-source project
You want to use someone’s project as a starting point for your own work
The Complete Forking Workflow
Fork the Repository
Navigate to the repository you want to fork
Click the “Fork” button in the top-right corner
Wait a few seconds for GitHub to create the fork in your account
Clone Your Forked Repository
After forking, clone the repository to your local machine using the methods described earlier
This creates a local copy of your fork, not the original repository
Make Changes and Push to Your Fork
Make the desired changes to the local copy
Commit your changes
Push the changes to your forked repository
Create a Pull Request (Optional)
If you want to contribute back to the original project, create a pull request
This proposes your changes to the original repository’s owner
Understanding the Relationship
When you fork a repository:
The original repository is called the “upstream repository”
Your copy is the “forked repository”
These repositories are separate, allowing independent development
You can sync changes from the upstream repository when needed
Working with Your Repositories
After cloning or forking a repository, you’ll need to make changes, commit them, and push them back to GitHub.
Basic Git Commands for Daily Work
Check Repository Status
Create a New Branch for Your Changes
Add Your Changed Files
Or add all changes:
Commit Your Changes
Push Your Changes to GitHub
Merging Repositories and Branches
Merging is Git’s way of integrating changes from one branch or repository into another.
Understanding Git Merge
Git merge combines multiple sequences of commits into one unified history. In typical scenarios, merging is used to combine two branches. When merging:
Git finds a common base commit between the branches
It creates a new “merge commit” that combines the changes
This merge commit has two parent commits (unlike regular commits)
How to Merge Branches
Checkout the Target Branch
Ensure Your Branch is Up-to-Date
Merge the Source Branch
Handle Any Merge Conflicts
If Git encounters conflicting changes, it will mark them in the affected files
Edit these files to resolve the conflicts
After resolving, add the files and commit the merge
Creating and Managing Pull Requests
Pull requests are the primary way to contribute changes from a fork back to the original repository.
Creating a Pull Request
Push Your Changes to Your Fork
Navigate to the Original Repository on GitHub
Click “Pull Requests” and then “New Pull Request”
Select the Base Repository/Branch and Your Fork/Branch
Review Your Changes and Create the Pull Request
Add a title and description
Explain what changes you’ve made and why
Merging a Pull Request
If you own the repository or have write access:
Review the Pull Request
Check the code changes
Run tests if applicable
Consider feedback from other collaborators
Merge the Pull Request
On GitHub, navigate to the pull request
Click “Merge pull request” if everything looks good
For repositories with merge queues, you can click “Merge when ready”
Best Practices and Tips
Workflow Recommendations
Always Create Branches for New Features
Keep the main branch clean and stable
Create feature branches for new development
Pull Before You Push
Always pull the latest changes before pushing your own
This reduces merge conflicts
Write Clear Commit Messages
Use descriptive messages that explain why changes were made
Follow the convention of a short title and longer description if needed
Common Pitfalls to Avoid
Working Directly on the Main Branch
This can cause conflicts and confusion
Always create feature branches for new work
Not Updating Your Fork Regularly
Your fork can become outdated if the original repository changes
Learn how to sync your fork with the upstream repository
Pushing Large Binary Files to Git
Git is not optimized for binary files
Consider Git LFS (Large File Storage) for large binary files
Conclusion
In this guide, we covered cloning, forking, and merging repositories on GitHub, essential for collaboration and version control. Cloning creates a local copy, forking allows independent development, and merging integrates changes efficiently. Pull requests facilitate structured contributions. Best practices include using feature branches, keeping repositories updated, and writing clear commit messages. By following these workflows, developers can collaborate effectively, reduce conflicts, and manage code efficiently, ensuring smooth project development and contribution to open-source or team-based projects.
Nikhil is an intern consultant at Marktechpost. He is pursuing an integrated dual degree in Materials at the Indian Institute of Technology, Kharagpur. Nikhil is an AI/ML enthusiast who is always researching applications in fields like biomaterials and biomedical science. With a strong background in Material Science, he is exploring new advancements and creating opportunities to contribute.
