To support a systematic approach to elementary school geometry, the authors present modules that each contain content related to a specific geometric learning area. These modules are not tied to specific grade levels and can be applied multiple times throughout the geometry curriculum. The modular structure helps to better connect geometric knowledge, featuring exemplary teaching examples, open assignments, and suggestions for extracurricular learning. The practical guide is aimed at teacher education students, trainees, and educators in elementary schools, as well as trainers.