Join this interactive workshop to master open source web mapping technologies using HTML, CSS, and JavaScript. Ideal for developers, this hands-on session covers everything from selecting suitable libraries (like Leaflet, MapLibre GL JS, and OpenLayers) to understanding core geospatial data concepts. Engage in practical exercises, setting up your environment, and creating interactive maps. Learn best practices, optimization techniques, and explore data visualization and cartographic design to enhance the impact and clarity of your maps. Whether you're new to GIS or seeking to refine your skills, this tutorial offers valuable insights and live demonstrations for building efficient, scalable mapping applications. The session concludes by providing tips on continuous learning and development in the field of open source GIS, equipping attendees with resources and knowledge to further their journey in mapping technology.