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

# Core Concepts

> The accounting model behind Vanna on Stellar: margin accounts, pools, vTokens, health factor and liquidation.

Vanna connects liquidity providers with margin accounts that can use borrowed funds in approved Stellar protocols. These pages explain the accounting behind the app.

> **[Margin accounts](https://docs.vanna.finance/stellar/learn/smart-accounts.md)**
>
> Token custody and account-level debt.

> **[Lending pools and vTokens](https://docs.vanna.finance/stellar/learn/lending-pools.md)**
>
> Supply, borrowing and how vToken receipts grow.

> **[Health factor and liquidation](https://docs.vanna.finance/stellar/learn/health-factor.md)**
>
> Collateral valuation and how liquidation resolves debt.

> **[Rates and prices](https://docs.vanna.finance/stellar/learn/interest-rate-model.md)**
>
> The interest-rate curve and the Reflector-backed oracle.

> **[Registry](https://docs.vanna.finance/stellar/learn/registry.md)**
>
> Permitted assets, contracts and controllers.

> **[Composable leverage](https://docs.vanna.finance/stellar/learn/composable-leverage.md)**
>
> Deploying borrowed capital into Blend, Soroswap and Aquarius.

These pages describe the Stellar testnet contracts, with XLM and three distinct USDC test tokens (BLUSDC, AqUSDC, SoUSDC). Contract addresses are listed in [Deployed Contracts](https://docs.vanna.finance/stellar/developers/deployed-contracts.md).

Also see [vTokens](https://docs.vanna.finance/stellar/learn/vtokens.md), [Liquidation](https://docs.vanna.finance/stellar/learn/liquidation.md), [Oracle System](https://docs.vanna.finance/stellar/learn/oracle-system.md), [Pool Mechanics](https://docs.vanna.finance/stellar/learn/lending-pool-mechanics.md) and [Protocol Architecture](https://docs.vanna.finance/stellar/learn/protocol-architecture.md).


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