> For the complete documentation index, see [llms.txt](https://invsto.gitbook.io/orca/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://invsto.gitbook.io/orca/getting-started/quick-reference-guide.md).

# Quick Reference Guide

Orca based backtesting can be done from the SharkSigma directly or it can be used as a Python package. In the following series, we will see some examples of how to write and backtest a strategy step-by-step in Python.