This is the 12605th most frequent Polish word.
nauczyłaś
"You (female) taught."
The word "nauczyłaś" here means "you learned" and is used in second person singular feminine past tense, indicating the subject is female and the learning process is completed.
Nauczyłaś się szybko korzystać z tego programu.
You learned quickly how to use this program.
In this sentence, "nauczyłaś" means "you taught" referring to teaching someone something. It's addressing the listener in a formal manner and denotes a completed action.
Czy nauczyłaś ich, jak rozwiązywać takie problemy?
Did you teach them how to solve such problems?
Here "nauczyłaś" is used to inquire what the addressed person (a female) gained knowledge about during a particular event in the past.