This is the 249th most frequent Korean word.
가진
"가진" means "having" or "possessing."
Here, '가진' is employed to connect the verb stem '가지다' (to have) with the noun '것' (thing), forming a compound structure meaning 'what you have.'
가진 것을 잃지 않도록 조심하세요.
Be careful not to lose what you have.
In this sentence, '가진' modifies '돈' (money) to indicate possession, specifying that the subject pertains to money that she had.
그녀는 가진 돈으로 새로운 옷을 샀다.
She bought new clothes with the money she had.
'가진' is used as a modifier in this sentence to describe the noun '사람' (person), indicating possession of passion (열정).