> For the complete documentation index, see [llms.txt](https://docs.xyo.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xyo.network/developers/introduction.md).

# Start Building on XL1

Choose a safe starting point for building, testing, and exploring applications on XYO Layer One.

XYO Layer One (XL1) lets applications publish verifiable data and transactions. Start with a local network when you are learning, move to the Sequence testnet when you need a shared environment, and use Mainnet only after your application has been tested and reviewed.

## Choose your path

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td>1</td><td><strong>Understand the environments</strong></td><td>Choose between Local, Sequence, and Mainnet before installing tools or funding an account.</td><td><a href="/developers/getting-started/environments.md">Choose an Environment</a></td></tr><tr><td>2</td><td><strong>Prepare your tools</strong></td><td>See the wallet, runtime, package manager, and explorer used by each guide.</td><td><a href="/developers/getting-started/tooling.md">Prepare Your Tools</a></td></tr><tr><td>3</td><td><strong>Build a first project</strong></td><td>Pick a verified sample based on what you want to learn.</td><td><a href="/developers/getting-started/first-project.md">Choose Your First Project</a></td></tr></tbody></table>

{% hint style="info" %}
New to XL1? Start with **Local**. It is isolated, uses disposable test accounts, and does not require public-network tokens.
{% endhint %}

## Common next steps

* [Install the XL1 browser wallet](/developers/xl1-wallet/get-xl1-browser-wallet.md)
* [Run a local blockchain and block producer](/developers/how-to-request-xl1-testnet-tokens-1.md)
* [Request Sequence test tokens](/developers/how-to-request-xl1-testnet-tokens.md)
* [Explore finalized blocks and transactions](/developers/xyo-block-explorer.md)


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