početi

početi

To begin.

Here, 'počeo' is used to indicate the beginning of an action, 'raditi,' which is an infinitive verb that the subject has started performing.

Počeo je raditi na novom projektu.

He has started working on a new project.

Here, 'početi' is used in its infinitive form in a question about initiating a future action 'učiti' (studying).

Kad ćeš početi učiti za ispit?

When will you start studying for the exam?

Here, 'početi' is used to emphasize the necessity of starting a mental process 'razmišljati' (thinking).

Moraš početi razmišljati o svojim ciljevima.

You need to start thinking about your goals.