This is the 69th most frequent Finnish word.
alkaa
"Alkaa" means "to begin" or "to start."
In this sentence, 'alkaa' is used to indicate the start of an activity or event, specifically the beginning of studying.
Opiskelu alkaa aikaisin aamulla.
Studying begins early in the morning.
Here, 'alkaa' is paired with another verb in its basic form (infinitive) to indicate the commencement of an action by the subject.
Minä alan oppia suomea.
I am beginning to learn Finnish.
In this example, 'alkaa' is used to denote the initiation of a time-related event, the beginning of spring, acting as the main verb of the clause.