This is the 37th most frequent Finnish word.
kertoi
"Told" or "said" (past tense of "kertoa").
In this sentence, 'kertoi' is used in the context of narrating or explaining a story to someone.
Hän kertoi tarinan meille.
He/she told us a story.
Here, 'kertoi' is utilized to describe a teacher conveying information or knowledge to students.
Opettaja kertoi meille tärkeitä asioita oppitunnilla.
The teacher told us important things during the lesson.
In this context, 'kertoi' is serving to signify the act of officially giving information to external parties.