> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognite.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Building with Cognite Data Fusion

> Use the Cognite API and SDKs to retrieve data, add context, and develop applications that match your operational needs.

> For the complete Cognite documentation index, see [/llms.txt](/llms.txt). For full page content, see [/llms-full.txt](/llms-full.txt).

## Getting started

<CardGroup cols={2}>
  <Card title="Development quickstart" icon="rocket" href="/dev/quickstart">
    Get your first API response in 5 minutes using Postman and Open Industrial Data—no admin setup required.
  </Card>

  <Card title="Use the API" icon="book-open" href="/dev/use_the_API">
    Learn how to construct requests to access resources using the RESTful web API, including HTTP methods and versioning.
  </Card>

  <Card title="API versions" icon="split" href="/dev/API_versioning">
    Understand API versioning, backwards compatibility policy, and the end-of-life schedule for API versions.
  </Card>

  <Card title="Set up Postman" icon="test-tube-diagonal" href="/dev/guides/postman">
    Configure Postman for your CDF project with OIDC. Use after trying the quickstart with sample data.
  </Card>

  <Card title="Developer tools" icon="sparkles" href="/dev/guides/ide_ai_integration">
    Connect your development environment to Cognite's documentation through MCP server and SKILL.md integration.
  </Card>

  <Card title="API reference" icon="book" href="/api-reference/concepts/20230101/api-description">
    Browse the complete API reference documentation with detailed endpoint specifications.
  </Card>
</CardGroup>

## API guides

<CardGroup cols={2}>
  <Card title="Working with time series data" icon="chart-line" href="/dev/concepts/time_series_index">
    Aggregate, subscribe to, and visualize time series data using the CDF API.
  </Card>

  <Card title="Working with units" icon="ruler" href="/dev/concepts/resource_types/units/index">
    Standardize measurement data and enable seamless unit conversion.
  </Card>

  <Card title="Using AI features" icon="microchip-ai" href="/dev/guides/ai/index">
    Search, summarize, and ask questions about documents with AI-powered APIs.
  </Card>

  <Card title="Advanced querying" icon="filter" href="/dev/guides/advanced-query/advanced_query_intro">
    Filter, sort, and aggregate data across CDF resources with advanced query techniques.
  </Card>

  <Card title="Entity matching" icon="link" href="/dev/concepts/resource_types/entity_matching">
    Match entities from different source systems using machine learning.
  </Card>

  <Card title="Geospatial" icon="map-location-dot" href="/dev/concepts/resource_types/geospatial">
    Work with geospatial data grouped into feature types.
  </Card>
</CardGroup>

## SDKs and toolkits

<CardGroup cols={2}>
  <Card title="Software Development Kits" icon="code" href="/dev/sdks">
    Access official SDKs for Python, JavaScript, and other languages to interact with the CDF API.
  </Card>

  <Card title="Identity and access management" icon="key" href="/cdf/access">
    Learn about authentication, authorization, and access control in Cognite Data Fusion.
  </Card>
</CardGroup>