This is the 377th most frequent Estonian word.
kooli
The Estonian word "kooli" means "to school" (genitive or illative case of "kool").
In this sentence, 'kooli' is in the genitive case, showing possession or association, indicating 'after school' as a time-related phrase.
Ma peale kooli lähen trenni.
After school, I go to training.
Here, 'kooli' is again in the genitive case, indicating relation or proximity to 'kool' (school).
Kooli juures asub park.
Near the school, there is a park.
Here, 'kooli' is the illative case, indicating movement towards or into 'kool' (school).