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GH-900 GitHub Foundations: Version Control, Collaboration, and Modern Development

GH-900, GitHub Foundations, is the current entry-level GitHub certification exam. Its January 2026 blueprint covers Git and GitHub basics, repositories, collaboration, modern development practices, projects, privacy and security, administration, and the open-source community. The exam is designed for developers and non-developers alike, so it focuses on how GitHub supports collaborative work rather than requiring deep programming expertise.

GitHub can look simple when reduced to “a place where code is stored,” but the platform combines version control, discussion, review, automation, project tracking, security, documentation, AI assistance, and community participation. GH-900 asks candidates to understand how those pieces fit together and when one feature is more appropriate than another.

The exam also provides a natural starting point for the broader GitHub certifications path. Learners can later specialize in enterprise administration, Actions, Copilot, advanced security, or agentic AI, but those roles all assume fluency with repositories, branches, commits, pull requests, issues, permissions, and collaboration.

Git and GitHub solve related but different problems

Git is a distributed version-control system. It records changes as commits, supports branches, and allows developers to work with local repository history. GitHub is a hosted collaboration platform built around Git repositories. It adds pull requests, issues, Actions, organizations, permissions, discussions, projects, security capabilities, and many other services.

This distinction matters because version control continues to work locally even without GitHub. A developer can create commits and branches offline, then push changes when connected to a remote. GitHub coordinates people and automation around that repository. Candidates should understand terms such as working tree, commit, branch, remote, clone, fork, push, pull, fetch, and merge at a conceptual level.

Version control protects more than code. Documentation, configuration, infrastructure definitions, policies, and data-transformation scripts can all benefit from traceable history. The core value is the ability to see what changed, who changed it, why it changed, and how to return to an earlier state when necessary.

Repositories communicate expectations as well as store files

A well-maintained repository contains more than source files. A README explains purpose and basic use. LICENSE states how others may use the work. CONTRIBUTING describes how to participate. CODEOWNERS can identify reviewers for paths. SECURITY provides a responsible channel for vulnerability reporting. Templates can standardize issues and pull requests.

Branches allow parallel work without forcing every change onto the default branch immediately. GitHub Flow commonly uses a branch for a change, a pull request for discussion and review, and a merge after checks succeed. This pattern creates a visible record of both code and decision-making.

Repository visibility and permissions affect who can see or modify content. Public repositories support open collaboration; private repositories restrict access; internal repositories can serve enterprise collaboration. Candidates should distinguish visibility from role permissions because a user may be able to view a repository without having authority to change it.

Pull requests turn changes into a collaborative review process

A pull request proposes a set of changes and creates a place for discussion, automated checks, review, and approval. Reviewers can comment on individual lines, request changes, approve work, or suggest alternatives. Linking a pull request to an issue connects implementation with the problem or request that motivated it.

Branch protection and rulesets can require reviews, status checks, signed commits, linear history, or other conditions before a merge. These controls help teams turn informal conventions into repeatable quality gates. At enterprise scale, those ideas grow into the governance concerns covered by GH-100 GitHub Enterprise Administrator.

Notifications help contributors follow the work that matters without manually checking every repository. Candidates should know how watching, subscriptions, mentions, assignments, and notification settings affect attention. Good collaboration requires both visibility and the ability to reduce noise.

Issues, discussions, and projects serve different coordination needs

Issues are useful for discrete work items such as bugs, features, tasks, or questions that need tracking. Labels, assignees, milestones, templates, and links to pull requests help organize them. Discussions are better for open-ended conversations, community questions, proposals, or knowledge sharing that may not map directly to a task.

GitHub Projects provide a flexible planning layer across issues and pull requests. Tables, boards, roadmaps, custom fields, filters, and workflows can help teams view work by status, priority, iteration, or ownership. Projects do not replace thoughtful planning; they make the state of collaborative work visible.

Gists, Wikis, Pages, and Markdown extend communication further. A Gist can share a small snippet or note, a Wiki can host repository documentation, GitHub Pages can publish static content, and Markdown provides consistent lightweight formatting across repositories and collaboration features.

Modern development on GitHub includes automation, cloud environments, and AI

GitHub Actions automates workflows in response to repository events. A team can build, test, package, scan, and deploy software without leaving the platform. GH-900 only requires a foundational understanding; deeper workflow design, runners, reusable actions, secrets, and enterprise automation are the domain of GH-200 GitHub Actions.

Codespaces provides cloud-hosted development environments that can be configured through dev-container settings, helping contributors start with consistent tools and dependencies. The github.dev editor offers a lighter browser-based editing experience without the full compute environment of a codespace. Candidates should know why a team might choose one over the other.

GitHub Copilot adds AI assistance for code suggestions, chat, explanations, and increasingly agent-oriented workflows. GH-900 expects recognition of its role and plan differences, while GH-300 GitHub Copilot focuses on responsible use, prompting, privacy, data flow, productivity, and safeguards.

Security begins with accounts, access, and repository controls

Two-factor authentication and passkeys strengthen account security. Organization and repository roles limit what users can do. Branch protections restrict risky changes. Enterprise Managed Users provide a model for centrally controlled identities in some enterprise deployments. These concepts are foundational because collaboration only works when identity and authorization are trustworthy.

Repository security also includes dependency information, vulnerability alerts, secret protection, and code scanning. GH-900 candidates should recognize these capabilities even though advanced configuration belongs in GH-500 GitHub Advanced Security.

Security is not only a feature toggle. Teams need clear ownership, protected default branches, reviewed changes, careful secret handling, and a process for reporting vulnerabilities. The SECURITY file and private vulnerability reporting options support responsible disclosure without forcing researchers to publish sensitive details in a public issue.

Open source and InnerSource use similar collaboration mechanics

GitHub is central to open-source development because forks, pull requests, issues, discussions, releases, and contributor guidelines make distributed participation manageable. A fork creates an independent copy under another account or organization, which is useful when a contributor cannot work directly in the original repository.

Open-source projects also depend on social and governance practices. Maintainers set contribution expectations, review changes, publish releases, and manage communities. Sponsors can support maintainers financially, while the Marketplace helps users discover applications and actions that extend GitHub.

InnerSource applies open-source collaboration patterns inside an organization. Teams make reusable internal code discoverable, publish contribution guidance, and accept changes across organizational boundaries. The repository may remain private, but the collaboration model encourages shared ownership and reduces duplicated solutions.

GitHub Flow teaches a durable way to reason about change

GitHub Flow is powerful because it creates small, reviewable units of work. A branch isolates a change, commits record progress, a pull request makes the change visible, automated checks provide evidence, reviewers add human judgment, and the merge integrates approved work. This cycle applies to code, documentation, infrastructure, and many operational repositories.

Merge strategies affect history. Merge commits preserve branch structure, squash merges condense a pull request into one commit, and rebasing can create a linear history. GH-900 candidates do not need to defend one universal strategy, but they should understand why teams choose differently based on auditability, readability, and workflow preferences.

The broader DevOps landscape builds on this same idea of fast, traceable feedback across development and operations. GitHub provides many tools for that lifecycle, but the value comes from disciplined collaboration rather than from any one feature.

Preparation should use GitHub as a working environment

GH-900 is best prepared for through direct use. Create a repository, add a README and license, make a branch, commit changes, open a pull request, review it, link it to an issue, and merge it. Create labels and a project, explore repository Insights, inspect security settings, and compare public, private, and organization contexts.

Then explore modern features at a conceptual level: create a simple Actions workflow, open a Codespace if available, review Copilot capabilities, and inspect the security tab. The goal is not advanced configuration but understanding where each capability fits in the repository lifecycle.

GH-900 validates practical platform literacy. Candidates who can explain how Git, repositories, collaboration tools, automation, projects, security, and community features work together will be prepared for the exam and have a strong foundation for every more specialized GitHub role that follows.

Releases and tags provide another foundational layer. Tags identify specific commits, while GitHub Releases can package notes and downloadable assets around a version. Teams often use semantic versioning or another release convention so consumers can understand whether a change is compatible, additive, or breaking. GH-900 does not require release-engineering depth, but candidates should know how repository history becomes a consumable software version.

Search and discoverability also matter. Topics, repository descriptions, READMEs, stars, organization pages, and dependency insights help users understand what a repository contains and whether it is maintained. These details are especially important in large organizations where developers may need to reuse an internal project they did not know existed.

Organizations and enterprises add another layer of structure. Organizations group repositories and teams under shared policies, while enterprise accounts can coordinate multiple organizations. Understanding these scopes helps candidates interpret where membership, billing, security, and administrative settings belong as GitHub use grows beyond a single project.

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