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

# Core Concepts

> Learn the fundamentals and key concepts of the Stellar blockchain, including data structures, fees, consensus, anchors, Stellar Ecosystem Proposals, and more.

Build your foundational understanding of what makes the Stellar network tick.

> **[Stellar Stack](/docs/learn/fundamentals/stellar-stack.md)**
>
> Explore the core components and architecture of the Stellar stack, and see how they work together to power a fast, scalable, and decentralized network.

> **[Lumens](/docs/learn/fundamentals/lumens.md)**
>
> Learn about lumens (XLM), the native digital asset of the Stellar network. Understand its role in transactions, network fees, and smart contract rent.

> **[Stellar Consensus Protocol](/docs/learn/fundamentals/stellar-consensus-protocol.md)**
>
> A brief overview of how the Stellar Consensus Protocol (SCP), a proof of agreement protocol, enables consensus and validates transactions on the network.

> **[Stellar Data Structures](/docs/learn/fundamentals/stellar-data-structures)**
>
> 5 items

> **[Stellar Decentralized Exchange](/docs/learn/fundamentals/liquidity-on-stellar-sdex-liquidity-pools.md)**
>
> Learn how liquidity pools enable trading on the Stellar Decentralized Exchange. Understand how they work, provide liquidity, and enable decentralized asset swaps on the network.

> **[Operations & Transactions](/docs/learn/fundamentals/transactions)**
>
> 4 items

> **[Fees, Resource Limits, and Metering](/docs/learn/fundamentals/fees-resource-limits-metering.md)**
>
> Learn how fees, resource limits, and metering work on the Stellar network. Understand cost structures, transaction pricing, and smart contract resource limits.

> **[Stellar Ecosystem Proposals](/docs/learn/fundamentals/stellar-ecosystem-proposals.md)**
>
> Learn about Stellar Ecosystem Proposals (SEPs), standards that enhance interoperability, improve functionality, and expand the network's capabilities.

> **[Smart Contracts](/docs/learn/fundamentals/contract-development)**
>
> 9 items

> **[Data Format](/docs/learn/fundamentals/data-format)**
>
> Understand Stellar's XDR and JSON encodings so you can inspect transactions, debug payloads, and interchange data with other systems.

> **[Anchors](/docs/learn/fundamentals/anchors.md)**
>
> Learn about the on and off ramps on Stellar called anchors and their role in bridging between the traditional financial system and blockchain networks.