# Useful resources and libraries

- [3.1 Procurement data online resources](/training-content/procurement-data-crash-course/useful-resources-and-libraries/3.1-procurement-data-online-resources.md)
- [Importance reference resources](/training-content/procurement-data-crash-course/useful-resources-and-libraries/3.1-procurement-data-online-resources/importance-reference-resources.md)
- [Online data repositories](/training-content/procurement-data-crash-course/useful-resources-and-libraries/3.1-procurement-data-online-resources/online-data-repositories.md)