This paper introduces the special feature, Geolinguistic Techniques in 2025. It first outlines the nature and significance of maps used in geolinguistics and linguistic/dialect geography, emphasizing their role as interpretive tools that help uncover patterns and histories of linguistic variation. The article distinguishes geolinguistic maps from other types, such as data maps, typological maps, and distribution maps, while highlighting their potential to reveal the historical and social dynamics of language variation. With the advancement of Geographic Information System (GIS), map production has become more flexible and accessible, though ongoing technical developments can be challenging for researchers unfamiliar with digital tools. This special feature aims to support researchers in producing meaningful geolinguistic maps and to foster further methodological development and accessibility in geolinguistic research, providing a practical manual and a case study.