This is the 277th most frequent Serbian word.
почетак
The beginning.
Here, 'почетак' means 'start', referring to the commencement or initial segment of an event, in this case, a movie.
Почетак филма је био веома узбудљив.
The start of the movie was very exciting.
In this sentence, 'почетак' is used in the phrase 'на почетку' to mean 'at the beginning,' referring to the starting point of a time period, the year.
На почетку године увек правим планове за будућност.
At the beginning of the year, I always make plans for the future.
'Почетак' in this sentence portrays the conceptual notion of initiating a process or undertaking, expressing its inherent difficulty.