This is the 423rd most frequent German word.
kopf
Head.
Here, 'Kopf' metaphorically refers to 'mind' or 'intelligence'.
Er hat einen scharfen Kopf für Mathematik.
He has a sharp mind for mathematics.
In this sentence, 'Kopf' refers to the literal head, the physical part of the body.
Sie hat sich am Kopf gestoßen.
She hit her head.
Here 'Kopf' is used to metaphorically signify the mind or thoughts, especially related to memory or concern.