This textbook serves as a practical guide for undergraduate and graduate students in geology, hydrology, ecology, and environmental sciences, teaching them applied GIS techniques. Presented as a step-by-step tutorial across seventeen chapters, the book starts with the fundamentals of GIS and progresses to real-life examples from geology and water resources. The focus is on ESRI's ArcGIS Pro, covering various tools for spatial, geostatistical, network, and 3-D analysis. Additionally, it explores ArcGIS Online and working with web apps like Web Map, StoryMaps, and GEO App. GIS applications, especially in water and environmental problem-solving, are rapidly growing worldwide. The demand for GIS experts utilizing spatial analysis in environmental science remains high. This textbook equips users with the necessary knowledge to become effective mappers and spatial analysts in the fields of environment, geosciences, and water resources, employing the latest state-of-the-art methodology. Each chapter provides exercises and supplementary materials available for download on SpringerLink, along with additional links for further learning opportunities.