Al-Madkhal ila 'Ilm Sharh al-Hadith - Khalid ar-Raddadi

This excellent book by Sheikh Khalid al-Raddadi will teach you everything you need to know about the science of commentary on the Prophetic Hadiths. There are many explanations, both on classic collections and on selected themes. The author provides an introduction to this science, describing the methodologies and giving examples.