This is the 227th most frequent Serbian word.
углавном
Mostly; mainly; generally.
Here, 'углавном' is used to express the primary activity during weekends.
Углавном читам књиге викендом.
I mainly read books on weekends.
In this sentence, 'углавном' indicates that while most aspects were fine, there might have been minor exceptions.
Углавном све је било у реду током путовања.
Mostly everything was fine during the trip.
'Углавном' here is used to describe the usual behavior or habit of the person.