This is the 203rd most frequent Croatian word.
najbolje
"Najbolje" means "the best" in English.
In this sentence, 'najbolje' is used as an adjective (in superlative) to describe the quality of 'solution'.
Ovo je najbolje rješenje za problem.
This is the best solution for the problem.
Here, 'najbolje' functions as an adverb, describing the manner of 'giving'.
Uvijek pokušavam dati najbolje od sebe u svemu što radim.
I always try to give my best in everything I do.
In this sentence, 'najbolje' is used as a neuter singular superlative adjective, acting nominally to describe the optimal action to take.