Hagahot MeAlfas Yashan on Bava Metzia Daf 6b
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
נ"ב דשט"ח אינו נקנה אלא בכתיב' ומסיר':
נ"ב לא כפי' הרי"ף: