Dictionary definition:
n. female parent

v. to nurture a child

First and accidental mother - no role model here - but became known as the mother of humankind

Whatever the word for mother - similarities in sound.

No 'one' way to be a mother
All kinds - biological, adoptive, single, step, mother to be, etc.

How do we learn how to be a mother - no manual. Look for examples....
in literature, media, history.