Expressions are one of QGIS's key features and a major pillar of its success. Powerful, flexible, and available almost everywhere in the interface, they allow for complete customization of any QGIS project, regardless of the desired level of complexity. Expressions provide a unified language that opens the door to increasingly creative and efficient uses, and are enriched with new features in each new version of QGIS.

This workshop will provide an opportunity to gain a thorough understanding of this language, starting with its fundamentals—expression structure, operators, and essential functions—and gradually progressing to more advanced uses such as conditional expressions, geometry generation, and variable manipulation.

We will cover the use of expressions in several parts of a QGIS project:
• Customizing labels
• Defining dynamic symbologies
• Configuring elements in layouts
• Creating dynamic feature forms
• Advanced use in the field calculator
• Filtering and selecting features (layer filters, expression selection, dynamic subsets)
• Geoprocessing
• etc.

Through concrete examples, participants will learn to fully leverage the potential of expressions. The workshop also aims to be a forum for discussion: everyone will be able to share their ideas, challenges, needs, and tips, contributing to a collective reflection on best practices and the future development of this essential language in QGIS.