> For the complete documentation index, see [llms.txt](https://xpansionchain-1.gitbook.io/xpansionchain/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xpansionchain-1.gitbook.io/xpansionchain/overview-of-xpansionchain.md).

# Overview of XpansionChain

## 📍 Start here

### 👷 I want to start building\![​](https://docs.x.immutable.com/docs/x/start-here#-i-want-to-start-building) <a href="#i-want-to-start-building" id="i-want-to-start-building"></a>

Find out about <mark style="color:blue;">**our SDKs and how they work together**</mark>

#### Launch an NFT collection[​](https://docs.x.immutable.com/docs/x/start-here#launch-an-nft-collection) <a href="#launch-an-nft-collection" id="launch-an-nft-collection"></a>

* Get your hands dirty quickly with our <mark style="color:blue;">**NFT minting tutorial**</mark>
* Already have a deployed token smart contract on L1? Learn how to <mark style="color:blue;">**register with**</mark> XpansionChain[ ](https://docs.x.immutable.com/docs/x/launch-collection) to mint tokens and transact on L2

#### Build a marketplace[​](https://docs.x.immutable.com/docs/x/start-here#build-a-marketplace) <a href="#build-a-marketplace" id="build-a-marketplace"></a>

* Set up <mark style="color:blue;">**our SDK**</mark>
* Learn how to <mark style="color:blue;">**display data about users and assets**</mark>
* Learn how to <mark style="color:blue;">**get user signatures**</mark> to facilitate <mark style="color:blue;">**creating orders**</mark> <mark style="color:blue;"></mark><mark style="color:blue;">and</mark> <mark style="color:blue;"></mark><mark style="color:blue;">**trades**</mark>

#### Something else?​ <a href="#something-else" id="something-else"></a>

* Get started with our <mark style="color:blue;">**guides**</mark>

### 🧑‍💻 I have an existing XpansionChain application​ <a href="#i-have-an-existing-immutable-x-application" id="i-have-an-existing-immutable-x-application"></a>

* Use our <mark style="color:blue;">**SDK documentation**</mark>
* Check out our <mark style="color:blue;">**API reference**</mark>

### 🤷 Not sure what XpansionChain can do for you?​ <a href="#not-sure-what-immutable-x-can-do-for-you" id="not-sure-what-immutable-x-can-do-for-you"></a>

* Learn about <mark style="color:blue;">**what XpansionChain  is**</mark>
* Find out <mark style="color:blue;">**what you can build on it**</mark>
* Level up your understanding with these <mark style="color:blue;">**key Web3 development concepts**</mark>