# skfolio > Python library for portfolio optimization, factor model construction, and risk management, built on top of scikit-learn: create, fine-tune, cross-validate, and stress-test portfolio models. 2026, skfolio developers (BSD License) ## Pages in this subsection - [Data Preparation](https://skfolio.org/auto_examples/data_preparation/index.html.md): Examples about data preparation. - [NOTE](https://skfolio.org/auto_examples/data_preparation/plot_1_investment_horizon.html.md): Go to the end ## Optional - [Top-level llms.txt](https://skfolio.org/llms.txt): Complete documentation index.