For anyone who needs to learn, review, or teach the concepts and methodologies of GIS analysis, Geospatial Analysis Online is a welcome boon. This resource is a free web-based version of the textbook Geospatial Analysis: A Comprehensive Guide, written by Michael de Smith and Paul Longley of the University College London and by Michael Goodchild of the University of California-Santa Barbara. As of this write-up, visitors to the above link will find the sixth edition of this handbook (published in 2018), which "address[es] the full spectrum of spatial analysis and associated modeling techniques that are provided within currently available and widely used geographic information systems (GIS) and associated software." Some of the topics covered in the book's 10 chapters include an overview of the conceptual frameworks used in spatial analysis, the core components of GIS analysis, discussions of spatial statistics and surface and field analysis, as well as big data as it relates to spatial analysis. This comprehensive guide can be read online in its entirety at the link above. Those interested in purchasing a physical or PDF e-book copy can find links to do so under Ordering. Other noteworthy portions of the Geospatial Analysis Online website include links to GIS-related Blogs, Software, and other Resources.