Mika Sorvoja enhanced the GispoCoding/master-training-data repository by refining QGIS training materials to improve clarity and reliability for learners. He updated R Markdown instructional content to clarify area terminology, ensuring that the calculated area for building polygons was explicitly defined and automatically updated, which streamlined the learning process. Additionally, Mika addressed cross-platform compatibility by correcting image file extension case sensitivity, preventing asset loading issues on case-sensitive systems. His work combined geospatial data analysis, QGIS, and technical writing, resulting in more maintainable and accessible training resources. The depth of these targeted improvements reduced support needs and improved onboarding consistency.