# General Reference


This section provides **lists and dictionaries** shared across modules: system models and operators, connector types and fields, API errors and rate limits, and product terminology.

| Page | Content |
| --- | --- |
| [System Model Library](system-models.md) | Quick reference for built-in LLMs and other models; comparison of 8 model API categories |
| [System Operator Library](system-operators.md) | List of system operators and their boundary with custom operators |
| [Connectors](connectors.md) | Complete list of connection fields for 41 data sources in 9 categories |
| [Error Codes](error-codes.md) | Handling Genesis / model API errors and rate limits |
| [Glossary](glossary.md) | English equivalents for terms used throughout the documentation |

## How to Use This Section with the Guides

| What you want to do | Where to go |
| --- | --- |
| Create / test / manage connectors | [Guide · Connectors](../../guides/ai-studio/data-sources/connectors.md) |
| Import or export data and manage import tasks | [Guide · Data Connections](../../guides/ai-studio/data-sources/index.md) |
| View the system catalog and custom operators in Catalog | [Catalog](../../guides/ai-studio/resource-center/catalog.md) |
| Call model APIs and manage keys and quotas | [Genesis](../../guides/genesis/index.md), [Developer](../../developer/index.md) |

## Documentation Contents

```{toctree}
:hidden:
:maxdepth: 1

glossary
connectors
system-models
system-operators
error-codes
```