This manual serves as a comprehensive guide for Bangladeshi farmers on high-quality seed production techniques for spices and oilseed crops developed by BARI. It outlines practical training methodologies, seed production protocols, and agro-technical recommendations to improve yield, purity, and disease resistance in crops such as onion, garlic, turmeric, and mustard. The manual also includes crop-specific seed production manuals like BARI Onion-6, BARI Garlic-2, BARI Turmeric Variety Manuals, and BARI Sharisha-18, each detailing field preparation, seed selection, pest management, and harvesting methods.