# Guide

The examples that show outputs (in `#` comments) are runnable as-is — they
use the stub backends from {py:mod}`action0.client.testing` instead of the
network, exactly like your tests would.

```{toctree}
:maxdepth: 2

installation
concepts
client
backends
streaming
hooks
errors
retries
caching
operations
testing
custom-backends
recipes
```