> For the complete documentation index, see [llms.txt](https://doc.cess.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.cess.network/developer/cess-sdk/sdk-golang/preface.md).

# Preface

If you need to access the CESS chain, conduct transactions, upload and download files, etc., you can install Go SDK first. This article provides multiple installation methods for Go SDK.

### SDK source code and API documentation

Please visit [GitHub](https://github.com/CESSProject/cess-go-sdk) to obtain the Go SDK source code. For more information, see [the Go SDK API documentation](https://pkg.go.dev/github.com/CESSProject/cess-go-sdk).

### Sample Program

Go SDK provides a wealth of sample programs for your reference or direct use. Examples include the following:

| Sample Files                                                                                                | Sample Content                                                                                                                                            |
| ----------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [NewChainClient](https://github.com/CESSProject/cess-go-sdk/blob/main/chain/chain.go#L99)                   | [Initialize Client](/developer/cess-sdk/sdk-golang/initialization.md)                                                                                     |
| [StoreFile](https://github.com/CESSProject/cess-go-sdk/blob/main/core/process/gateway.go#L49)               | [Store files on the gateway](/developer/cess-sdk/sdk-golang/object_file/storefile.md)                                                                     |
| [StoreObject](https://github.com/CESSProject/cess-go-sdk/blob/main/core/process/gateway.go#L157)            | [Store objects on the gateway](/developer/cess-sdk/sdk-golang/object_file/storeobject.md)                                                                 |
| [RetrieveFile](https://github.com/CESSProject/cess-go-sdk/blob/main/core/process/gateway.go#L218)           | [Retrieve files from the gateway](/developer/cess-sdk/sdk-golang/object_file/retrievefile.md)                                                             |
| [RetrieveObject](https://github.com/CESSProject/cess-go-sdk/blob/main/core/process/gateway.go#L300)         | [Retrieve objects from the gateway](/developer/cess-sdk/sdk-golang/object_file/retrieveobject.md)                                                         |
| [StoreFileToMiners](https://github.com/CESSProject/cess-go-sdk/blob/main/core/process/storage.go#L50)       | [Store a file to miners](https://github.com/CESSProject/doc-v2/blob/main/developer/cess-sdk/sdk-golang/object_file/StoreFileToMiners/README.md)           |
| [RetrieveFileFromMiners](https://github.com/CESSProject/cess-go-sdk/blob/main/core/process/storage.go#L175) | [Retrieve a file from miners](https://github.com/CESSProject/doc-v2/blob/main/developer/cess-sdk/sdk-golang/object_file/RetrieveFileFromMiners/README.md) |