This detailed article by Chaviva Gordon-Bennett explains the meaning, origins, customs, and practical how-to’s of the blessing over the bread on Shabbat,
This introductory article by Rabbi Mendy Hecht explains the commandment of ‘Hafrashat Challah’ (‘separating challah’), complete with the English transliteration and
This article from Chabad.org discusses the halachic (legal) and Kabbalistic (mystical) explanations for ‘scratching’ the Challah before the blessing over the bread on