# How-To

This section offers guides that address technical aspects of working with the Hydrosphere platform.

* [Write definitions](https://docs.hydrosphere.io/master/quickstart/how-to/write-definitions)
* [Invoke applications](https://docs.hydrosphere.io/master/quickstart/how-to/invoke-applications)
* [Monitoring external models](https://docs.hydrosphere.io/master/quickstart/tutorials/monitoring-external-models)
* [Develop runtimes](https://docs.hydrosphere.io/master/quickstart/how-to/develop-runtimes)
* [Use private pip repository](https://docs.hydrosphere.io/master/quickstart/how-to/pip-config)