What are the common causes of basement leaking and how can it be effectively prevented or repaired?

Common causes of basement leaking include poor drainage around the foundation, cracks in the walls or floors, and faulty seals around Windows or doors. To prevent or repair basement leaks, ensure proper grading and drainage away from the foundation, seal any cracks with waterproofing materials, and install or repair seals around Windows and doors. Additionally, consider installing a sump pump or waterproofing system for added protection.