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-# Learning track
+# Learning Tracks
 
-Learning tracks display on guides pages. Learning tracks are a list of related articles that learners can go through sequentially.
+This module manages "Learning Tracks"—curated, ordered lists of articles that guide a user through a specific topic or goal. When a user enters a learning track, they see a persistent banner or navigation element that helps them move sequentially through the guides.
+
+## Purpose & Scope
+
+The goal of this feature is to:
+- **Group Content**: Logically group related articles into a sequence.
+- **Guide Users**: Provide "Next" and "Previous" navigation context to keep users on the path.
+- **Track Progress**: Visually indicate where the user is within the sequence (e.g., "Step 2 of 5").
+
+## Architecture
+
+### Data Source
+
+Learning tracks are defined in YAML files located in `data/learning-tracks`.
+- **Structure**: `data/learning-tracks/<product>.yml`
+- **Schema**: Each file contains multiple tracks, where each track is defined as a top-level key with properties like:
+  - `title`: Display title of the track.
+  - `description`: Short summary.
+  - `guides`: An ordered list of relative paths to the articles.
+  - `versions`: (Optional) Which versions this track applies to.
+
+### Middleware
+
+The core logic for *active* tracking happens in `src/learning-track/middleware/learning-track.ts`.
+- **Trigger**: It looks for the `?learn=<track_name>` query parameter in the URL.
+- **Context Injection**: If a valid track is found:
+  - It calculates the current position (index) based on the current page path.
+  - It resolves the `prevGuide` and `nextGuide` links.
+  - It injects a `currentLearningTrack` object into `req.context`, which the UI components use to render the progress banner.
+
+### Library
+
+`src/learning-track/lib/process-learning-tracks.ts` is used (often by landing pages) to list available tracks.
+- **Rendering**: It handles Liquid rendering for titles and descriptions.
+- **Versioning**: It filters out tracks or specific guides that don't exist in the current documentation version.
+- **Translation Fallback**: It ensures that if a translated track has broken data, it falls back to the English structure (guides list) while keeping translated titles if possible.
+
+## Setup & Usage
+
+### Defining a Track
+
+Add a track to `data/learning-tracks/YOUR_PRODUCT.yml`:
+
+```yaml
+getting_started:
+  title: "Getting Started with GitHub"
+  description: "Learn the basics of repositories and commits."
+  versions:
+    fpt: '*'
+    ghec: '*'
+  guides:
+    - /get-started/signing-up-for-github/signing-up-for-a-new-github-account
+    - /get-started/first-steps-with-git/set-up-git
+```
+
+### Linking to a Track
+
+To start a user on a track, link to the first guide with the `learn` parameter (matching the track key defined in the YAML):
+`/en/get-started/signing-up-for-github/signing-up-for-a-new-github-account?learn=getting_started`
+
+### URL Structure
+
+- **`learn=<track_name>`**: Identifies the active track.
+- **`learnProduct=<product_name>`**: (Optional) Used when the track belongs to a different product than the current page context.
+
+## Dependencies
+
+- **`data/learning-tracks`**: The source of truth for track definitions.
+- **`src/content-render`**: Used to render Liquid within track titles and descriptions.
+- **`src/versions`**: Used to filter tracks based on the current page version.
+
+## Ownership
+
+- **Team**: `@github/docs-engineering`
+- **Content Owners**: The Writers and Content Strategists who define the tracks in the `data` directory.
+
+## Current State & Known Issues
+
+- **Query Param Persistence**: The feature relies on the `?learn=` parameter persisting as the user clicks links. If a user navigates away via a link that doesn't preserve query params (e.g., a standard markdown link outside the track navigation), they "fall off" the track.
+- **Translation Sync**: Translators sometimes translate the `guides` list paths or break the YAML structure. The code has specific logic to force-use English guide lists to prevent 404s in translated versions.
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