This is the 1963rd most frequent Russian word.
советует
"Советует" means "advises" in English.
The verb "советует" here indicates that the teacher is giving a recommendation or advice to the students.
Учитель советует ученикам использовать словарь для нового урока.
The teacher advises the students to use a dictionary for the new lesson.
In this sentence, "советует" is used to express suggestion from Sergei to his sister regarding something she might find enjoyable.
Сергей советует своей сестре попробовать этот ресторан.
Sergei advises his sister to try this restaurant.
Here, "советует" conveys a friend's recommendation about reading a particular book.