This is the 2408th most frequent Russian word.
ошибке
"Ошибке" means "mistake" or "error" in English.
In this sentence, 'ошибке' is in the prepositional case, used after the preposition 'на' to indicate the location or subject related to an action or state.
Учитель указал на ошибке в контрольной работе.
The teacher pointed out the mistake in the test work.
Here, 'ошибке' again is in the prepositional case and is part of the expression 'учиться на' which means 'to learn from'.
Мы учимся на своих ошибке.
We learn from our mistakes.
In this example, the base form 'ошибка' is used in the nominative case, acting as the subject of the sentence.