This is the 43rd most frequent Serbian word.
своје
"Своје" means "one's own" in English.
The word 'своје' refers to the noun 'projects', showing possessive ownership connected to the subject 'he'.
Он је успешно завршио своје пројекте.
He successfully completed his projects.
The word 'своје' refers to the noun 'things', indicating possession related to the subject 'you'.
Можеш узети своје ствари кад год пожелиш.
You can take your things whenever you wish.
The word 'својим' is a grammatical variation of 'своје', adapting to the grammatical case (instrumental) and gender/number agreement with 'породицом'.