This is the 470th most frequent Croatian word.
postao
"Postao" means "became" in English.
Here, 'postao' is used to indicate a change of state or becoming something new—specifically, becoming a doctor.
On je postao doktor nakon mnogo godina učenja.
He became a doctor after many years of studying.
In this sentence, 'postao' denotes transitioning to be part of a group or team.
Prošle godine sam postao dio tima za istraživanja.
Last year, I became part of the research team.
Here, 'postao' reflects the transformation of an idea or aspiration (a dream) into a tangible or realized state (reality).