Interview Q&A

Short answer: Create a branch to restore it: git checkout -b recovery-branch <commit-hash>

Example code

Create a branch to restore it: git checkout -b recovery-branch <commit-hash>

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: If you deleted a branch accidentally but haven’t run garbage collection yet, it can be recovered using the commit log. Steps: Find the last commit of that branch: git reflog Example output: abc1234 refs/heads/feature/login: commit: Add login validation

Real-world example (ShopNest)

Feature work for “UPI payment” lives on feature/upi-payment. Open a PR to main; resolve conflicts before merge.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: <<<<<<< HEAD Your changes ======= Incoming changes >>>>>>> main

Real-world example (ShopNest)

Feature work for “UPI payment” lives on feature/upi-payment. Open a PR to main; resolve conflicts before merge.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Large binary files (like images, videos, or data models) bloat Git repositories since Git stores every version.

Explain a bit more

To handle them efficiently, I use Git LFS (Large File Storage). Setup: git lfs install git lfs track "*.psd" git add .gitattributes git commit -m "Track Photoshop files with Git LFS" Explanation: Git LFS replaces large files with lightweight text pointers inside Git, while the actual binary files are stored on a separate LFS server. Example: If a game project has large texture files, Git LFS prevents the repo from becoming gigabytes in size, improving clone and fetch performance.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: If a commit has been pushed to a shared branch, the safest way is to revert it — not remove it.

Explain a bit more

git revert <commit-hash> This creates a new commit that undoes the changes from the old one, without rewriting history. Example: If you pushed a buggy commit that broke the login page, git revert creates a new commit that removes those buggy changes while keeping the history intact. ⚠ Avoid git reset on shared branches because it rewrites history — it can mess up others’ work.

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: You can create and switch to a new branch using: git checkout -b feature/login-page This creates a branch named feature/login-page and switches you to it immediately.

Explain a bit more

Alternatively, you can do it in two steps: git branch feature/login-page git checkout feature/login-page Real-world example: If your team assigns you to build a login page, you can create a branch feature/login-page to isolate your changes from the main code.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A system where every developer has a full copy of the repository, including its entire history, allowing for offline work and decentralized collaboration.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: (Working Directory, Staging Area, Repository) Working Directory: This is where you make changes to the files.

Explain a bit more

It's your local workspace where you're actively editing code. Staging Area (Index): This is like a holding area where you prepare files before committing them to the repository. You can choose which changes to add here. Repository: This is where Git stores the project’s history (commits). It's the permanent record of your project's evolution. Real-World

Example code

When you're editing code, it starts in the working directory. After editing, you "stage" your changes (using git add), which moves them to the staging area. Once you're ready to save your changes permanently, you commit them to the repository using git commit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Signed commits ensure authenticity — they’re cryptographically verified with a GPG or SSH key, proving the commit really came from you and wasn’t tampered with. Setup: Generate a GPG key: gpg --full-generate-key

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Both commands integrate changes from one branch into another, but they work differently: git merge combines the histories of two branches, creating a new “merge commit.” git rebase rewrites history by placing your branch’s commits on top of another branch, making it look like you developed your changes sequentially.

Explain a bit more

Real-world analogy: Merge: Like combining two storylines into one — you keep both histories. Rebase: Like rewriting your story so it appears you followed the main storyline all along. Example: If your feature branch has diverged from main, merging will keep both timelines, while rebasing will make it look like your branch was based on the latest main version all along.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: rea, Repository) Working Directory: This is where you make changes to the files. It's your local workspace where you're actively editing code.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: next commit), Local Repository (committed files).

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Mask secrets automatically using: run: echo "Deploying..." && echo "${{ secrets.AWS_SECRET_KEY }}" GitHub automatically redacts these values from logs.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: You’ll see a green “Verified” badge on signed commits. Why it matters: Verifies authorship for open-source contributions. Helps in regulated environments (e.g., fintech, healthcare). Prevents supply chain attacks via spoofed commits. Real-world example: In a security-conscious org, all commits to the main branch are required to be GPG-signed — GitHub enforces this with branch protection rules.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Signed commits ensure authenticity — they’re cryptographically verified with a GPG or SSH key, proving the commit really came from you and wasn’t tampered with. Setup: Generate a GPG key: gpg --full-generate-key

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: git remote add origin git push --all origin git push --tags origin

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Prune and repack: git gc --prune=now --aggressive

Real-world example (ShopNest)

Feature work for “UPI payment” lives on feature/upi-payment. Open a PR to main; resolve conflicts before merge.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A force push can rewrite history and make commits disappear from the remote branch — but they’re often recoverable. Steps: Run git reflog locally to view all commit references: git reflog show origin/main

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: git filter-repo (preferred) git filter-repo --path path/to/file --invert-paths

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: git add . git commit git push

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A Git submodule is a repository inside another repository — useful for including shared components or libraries.

Example code

You have multiple microservices that share a common authentication library. Instead of duplicating it, you include it as a submodule: git submodule add libs/auth Pros: Keeps shared code centralized. Cons: Requires careful syncing; new contributors must initialize submodules using: git submodule update --init --recursive

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Forking is when you create your own copy of someone else’s GitHub repository.

Explain a bit more

You do this directly on GitHub by clicking the “Fork” button on the top right of the repository page. Example: You want to contribute to a public project like freeCodeCamp. You click Fork, creating your own version under your account. You can modify it freely and then make pull requests to the original project. Command-line analogy: Forking is like cloning, but on the GitHub server level — it gives you your own remote repository to push to.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Add the resolved file: git add <file> git commit # or continue the rebase

Real-world example (ShopNest)

Feature work for “UPI payment” lives on feature/upi-payment. Open a PR to main; resolve conflicts before merge.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Mark conflicts as resolved: git add <filename> git commit

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Working Directory: This is where you make changes to the files. It's your local workspace where you're actively editing code.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.