What are the common causes of cracks in tile floor and how can they be prevented or repaired effectively?

Common causes of cracks in tile floors include improper installation, structural movement, and heavy impact. To prevent cracks, ensure proper installation by a professional, use high-quality materials, and address any underlying structural issues. Cracks can be repaired effectively by replacing the cracked tiles, filling the cracks with epoxy or grout, and addressing any underlying issues causing the cracks.