Free GH-900 sample questions

Correct answer: git pull

A `git pull` performs a `git fetch` followed by a `git merge`. This downloads the new commits from the remote and merges them into the local branch. Once the merge is resolved (and any conflicts fixed), the local history includes the remote work, allowing a standard `git push` to succeed. `git push --force` would overwrite remote history, potentially causing data loss for others.

Correct answer: Blame view

The 'Blame' view (often called 'Annotate' in other tools) in GitHub displays the file content alongside the commit hash, author, and date for the last modification of every single line. This is the primary tool for tracing the origin of specific code changes.

Correct answer: A Personal Access Token (PAT)

When 2FA is enabled, basic password authentication is disabled for Git over HTTPS. Users must generate and use a Personal Access Token (PAT) with the appropriate scopes (like `repo`) as their password. Alternatively, they could use SSH keys or the Git Credential Manager.

Correct answer: git rebase main

`git rebase main` rewrites the project history by creating new commits for each commit in the original branch, placing them after the last commit of the `main` branch. This creates a linear history, unlike `git merge`, which creates a special merge commit that ties the two histories together.

Correct answer: .gitignore

The `.gitignore` file specifies intentionally untracked files that Git should ignore. Files already tracked by Git are not affected; it prevents new files (like log files, binaries, or `.env` files) from being accidentally staged and committed.

Correct answers: To use the repository as a starting point for your own distinct project.; To contribute to an open-source project where you do not have write access.

Forking is also used to take an existing project and diverge it into a new, separate project (often called a 'hard fork') that you manage independently.

Forking creates a personal copy of the repository on your GitHub account. This is essential for contributing to open-source projects where you lack permission to push directly to the original (upstream) repository.

Correct answer: Markdown (.md)

GitHub flavored Markdown (.md) is the standard format for documentation on GitHub. It allows for lightweight formatting that renders directly in the GitHub UI, including the repository root README.

Correct answer: Revoking access prevents them from pushing or pulling updates, but they retain the code they already cloned.

Because Git is distributed, a 'clone' is a full local copy. Revoking server access only prevents future synchronization (push/pull). It cannot delete data already stored on a user's local machine. This is a critical security consideration for distributed version control.