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GH-900 Quick Reference - GitHub Foundations

Concise cross-domain revision guide for the GH-900 exam.

Domain Coverage Snapshot

Domain Weight Focus
1. Introduction to Git and GitHub 22% Core concepts, accounts, visibility
2. Working with GitHub Repositories 8% Files, branches, tags, releases
3. Collaboration Features 30% PRs, reviews, issues, discussions
4. Modern Development 13% Codespaces, Actions, runners
5. Project Management 7% Projects, milestones, planning
6. Privacy, Security, and Administration 10% Auth, security features, policies
7. Benefits of the GitHub Community 10% Open source, community standards

Warning

Collaboration (30%) + Introduction (22%) make up over half of the exam blueprint.

Domain 1 - Introduction to Git and GitHub (22%)

Git vs GitHub

Topic Git GitHub
Role Version control system Collaboration and platform services
Typical use Local history, branching, merging PR review, issues, Actions, security
Internet dependency Not required for local operations Required for hosted collaboration

Repository Visibility

Type Visibility Typical scenario
Public Anyone Open-source projects
Private Explicit users/teams only Internal or restricted repositories
Internal Enterprise members Cross-org enterprise sharing

Account Models

Type Best use
User account Individual development and learning
Organization Team ownership and role-based access

Tip

If the scenario emphasizes shared ownership and centralized governance, favor organizations.

Domain 2 - Working with GitHub Repositories (8%)

Core Workflow

  1. Clone repository
  2. Create feature branch
  3. Commit focused changes
  4. Open pull request
  5. Review, update, merge

Releases and Tags

Concept Meaning
Tag Marker for a specific commit
Release Tag + release notes + assets
Tag types Lightweight vs annotated

Tip

Releases are created from tags, and can include attached binaries.

Domain 3 - Collaboration Features (30%)

Collaboration Toolbox

Feature Use
Pull requests Structured review and merge
Reviews Approval and change requests
Issues Track work, bugs, tasks
Discussions Q and A or long-form threads
Mentions Notify people or teams

Common PR Flow

  1. Open PR with summary and context
  2. Request reviews
  3. Address feedback
  4. Merge with chosen strategy

Warning

Collaboration is the largest domain. Expect scenario-based questions.

Domain 4 - Modern Development (13%)

Codespaces Snapshot

Item Description
Codespace Cloud dev environment in a container
devcontainer.json Defines tools, settings, and extensions
Lifecycle Create, start, stop, rebuild, delete

Actions and Runners

Item Description
Workflow YAML automation in .github/workflows/
Runner types GitHub-hosted or self-hosted
Triggers push, pull_request, workflow_dispatch

Tip

Use GitHub-hosted runners for standard workloads; self-hosted for custom or regulated environments.

Domain 5 - Project Management (7%)

Planning Toolset

Feature Use
Projects (v2) Board, table, roadmap views
Milestones Group work by release objective
Labels Categorization and triage

Tip

Use issue templates to improve consistency and reduce triage time.

Domain 6 - Privacy, Security, and Administration (10%)

Security Controls

Control Purpose
2FA Stronger account authentication
Rulesets Enforce branch and tag protections
Dependabot Detect and fix vulnerable dependencies
Secret scanning Detect exposed credentials
CODEOWNERS Enforce reviewer ownership

Auth Basics

  • PATs can be classic or fine-grained.
  • SSH keys are tied to devices and can be rotated.
  • GitHub Apps use granular permissions and installation scopes.

Warning

Public repositories can leak secrets quickly. Use secret scanning and push protection when available.

Domain 7 - Benefits of the GitHub Community (10%)

Community Standards

Item Purpose
README Entry point for users and contributors
CONTRIBUTING Contribution rules and expectations
CODE_OF_CONDUCT Expected behavior
LICENSE Legal usage terms

Open Source Basics

  • Fork to contribute; use PRs for review.
  • Use Discussions for support and FAQs.
  • Follow issue templates to keep triage clean.

Last-Week Study Plan

Day Focus
Day 1 Domain 1 + GitHub Skills intro labs
Day 2 Domain 3 collaboration drills
Day 3 Domain 2 repo workflows + releases
Day 4 Domain 4 Actions + Codespaces overview
Day 5 Domain 6 security controls and auth
Day 6 Domain 5 planning + domain 7 community standards
Day 7 Mock questions + weak area revision