Question 1

What is GitHub, and how does it differ from Git?

Accepted Answer

Git is a command-line tool used locally to track files and version history. GitHub is a cloud-based hosting service that manages Git repositories, providing a web interface, social collaboration features (Pull Requests, issues), team management, and project tracking tools.

Question 2

What is a Pull Request (PR) on GitHub?

Accepted Answer

A Pull Request is a feature on GitHub that allows developers to notify team members that they have completed a feature or fix in a branch and want to merge it back into the main codebase. It provides a visual interface to review code changes, run automated tests, discuss feedback, and resolve conflicts before merging.

Question 3

What is Forking a repository?

Accepted Answer

A Fork is a copy of a repository hosted in your own personal GitHub account. Forking allows you to freely experiment and make changes to a project without affecting the original upstream repository. It is the standard workflow for open-source contributions.

Question 4

What are GitHub Actions, and how do they work?

Accepted Answer

GitHub Actions is an integrated CI/CD tool that automates software workflows directly in GitHub repositories. Workflows are defined in YAML files inside the `.github/workflows/` directory. They are event-driven (triggered by push, pull request, schedule) and execute jobs containing sequential steps on virtual environments (runners).
Code Example:
# .github/workflows/main.yml
name: CI
on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm install && npm test

Question 5

What are GitHub Pages?

Accepted Answer

GitHub Pages is a static site hosting service that takes HTML, CSS, and JavaScript files directly from a designated branch of a GitHub repository, compiles static assets (like Jekyll files), and publishes them as a live website.

Question 6

What are Branch Protection Rules, and why are they used?

Accepted Answer

Branch Protection Rules enforce administrative safeguards on specific branches (like `main`). They prevent developers from deleting branches, pushing code directly (forcing all changes to go through Pull Requests), and merging code without approvals or passing status checks (CI tests).

Question 7

How do you manage sensitive credentials (API keys, passwords) in GitHub Actions?

Accepted Answer

Sensitive credentials should never be committed to source files. They are managed using **GitHub Secrets**. Secrets are encrypted variables defined at the repository or organization level, which are decrypted at runtime in GitHub Actions workflows.
Code Example:
steps:
  - name: Deploy API
    env:
      API_KEY: ${{ secrets.MY_API_SECRET_KEY }}
    run: ./deploy.sh

Question 8

What is the difference between a Contributor and a Collaborator on GitHub?

Accepted Answer

A Collaborator is a user who has been granted explicit read/write access to a repository by the owner, allowing them to push code directly. A Contributor is anyone who has made pull requests or contributions that were merged into the repository, but may not have direct push access.

Question 9

What is a Gist on GitHub?

Accepted Answer

A Gist is a simple way to share single code snippets, configuration files, notes, or small scripts. Gists can be public or secret, are version-controlled by Git, and can be cloned, updated, or embedded directly into articles.

Question 10

Explain the difference between merging a PR using Merge Commit, Squash and Merge, and Rebase and Merge.

Accepted Answer

1. Create a Merge Commit: Merges all commits from the feature branch into the target branch, preserving individual commits and adding a merge commit tracking the intersection.
2. Squash and Merge: Combines (squashes) all commits of the PR into a single unified commit on the target branch, keeping history clean.
3. Rebase and Merge: Re-applies all commits of the feature branch individually on top of the target branch without a merge commit, creating a linear history.

Question 11

What is GitHub Enterprise?

Accepted Answer

GitHub Enterprise is the self-hosted or dedicated cloud version of GitHub designed for large organizations. It offers advanced compliance controls, single sign-on (SSO), security scanning, private package hosting, and local server deployment.

Question 12

What is dependabot, and how does it help developers?

Accepted Answer

Dependabot is an automated security tool built into GitHub. It scans project dependencies (e.g. packages in `package.json` or `requirements.txt`) for known vulnerabilities. If a vulnerability is found, Dependabot automatically opens a Pull Request updating the package to a safe version.

Question 13

What is GitHub Copilot?

Accepted Answer

GitHub Copilot is an AI-powered code completion tool developed by GitHub in collaboration with OpenAI. It integrates into IDEs (like VS Code) to provide real-time suggestions, complete code blocks, generate tests, and explain code using LLM context.

Question 14

Explain GitHub Releases and Tags.

Accepted Answer

A Tag is a git pointer to a specific commit signifying a version point (e.g. `v1.0.0`). A GitHub Release builds on top of a git tag, providing a download bundle (ZIP/TAR) of the source code, compiled binaries, and markdown release notes explaining changes.

Question 15

How do you resolve a Pull Request conflict on GitHub?

Accepted Answer

If a conflict is simple, it can be resolved directly on GitHub using the web-based conflict editor. For complex conflicts (requiring compilation, local tests), you must fetch the branch locally, merge the target branch into your branch, resolve the conflicts in your IDE, commit, and push back to GitHub.

Question 16

What is a draft Pull Request?

Accepted Answer

A draft Pull Request is a way to open a PR to share work-in-progress, get early feedback, or track CI tests without signaling that the PR is ready for formal review. Draft PRs cannot be merged until they are marked as 'Ready for review'.

Question 17

Explain CODEOWNERS on GitHub.

Accepted Answer

The `CODEOWNERS` file (placed in root or `.github/`) automatically assigns review requests to specific developers or teams whenever a Pull Request modifies files in directories they own.
Code Example:
# Assign JavaScript file reviews to @js-team
*.js @js-team

# Assign database folder changes to @db-admin
/db/ @db-admin

Question 18

What is the difference between Github Issues and Pull Requests?

Accepted Answer

GitHub Issues are used for tracking bugs, suggesting new features, planning work items, and general discussions. Pull Requests are actual proposals to change code, linking to a specific git branch with diffs.

Question 19

What is GitHub Packages?

Accepted Answer

GitHub Packages is a package hosting service that allows you to host private or public packages (npm, docker images, Maven, NuGet) directly alongside your repository code, providing integrated dependency hosting.

Question 20

What is branch deploy or environment environment tracking in GitHub?

Accepted Answer

GitHub Environments allow you to configure target environments (e.g., staging, production) with specific secrets, branch access rules, and deployment approvals. When a deploy workflow runs, GitHub tracks deployments on a dedicated page for audits.

GitHub Platform Interview

Difficulty Filters

Tools & Options

What is GitHub, and how does it differ from Git?

What is a Pull Request (PR) on GitHub?

What is Forking a repository?

What are GitHub Actions, and how do they work?

What are GitHub Pages?

What are Branch Protection Rules, and why are they used?

How do you manage sensitive credentials (API keys, passwords) in GitHub Actions?

What is the difference between a Contributor and a Collaborator on GitHub?

What is a Gist on GitHub?

Explain the difference between merging a PR using Merge Commit, Squash and Merge, and Rebase and Merge.

What is GitHub Enterprise?

What is dependabot, and how does it help developers?

What is GitHub Copilot?

Explain GitHub Releases and Tags.

How do you resolve a Pull Request conflict on GitHub?

What is a draft Pull Request?

Explain CODEOWNERS on GitHub.

What is the difference between Github Issues and Pull Requests?

What is GitHub Packages?

What is branch deploy or environment environment tracking in GitHub?

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