> ## Documentation Index > Fetch the complete documentation index at: https://docs.yield.xyz/llms.txt > Use this file to discover all available pages before exploring further. # Core concepts > The five ideas behind an Earn integration: yields, metadata, actions, balances, and reward history. A yield is one earning opportunity on one network: staking, lending, a vault, an LP, or an RWA. Every yield is described in the same format, and its metadata says what it accepts, what it currently pays, and exactly what each action on it requires. An action (`enter`, `exit`, or `manage`) requests a change to a position and returns unsigned transactions for you to sign. Once you sign and submit them, the position appears in balances, split by state and listing its pending actions, and reward and history data (current rates, claimable rewards, historical APY and TVL) put it in context. ## The five concepts Find yields with `GET /v1/yields`, which returns only the yields enabled for your project, filterable and paginated. The full shape of a yield: tokens, rates, risk ratings, mechanics, fees, argument schemas, and live state. How an `enter`, `exit`, or `manage` request turns into unsigned transactions, and how you track them. A position's state after you enter (active, entering, exiting, withdrawable, claimable, or locked) and the actions available on it. How rewards are represented, and how current rates differ from historical APY and TVL. For the hands-on version of this flow, run through [Quickstart](/documentation/get-started/quickstart). Yields also carry configurable [monetization](/documentation/earn/monetization) options. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.