Rule reminder
'Capire' = to understand (general, colloquial). 'Comprendere' = to understand (more formal, also implies empathy or broader comprehension). 'Rendersi conto' = to realize (often sudden awareness of a fact or situation). 'Afferrare' = to grasp (colloquial, implies effort — 'I finally get it!').
Non ho _____ niente di quello che hai detto — puoi ripetere?