Here are some examples:
* Eu quero aprender português. (I want to learn Portuguese.)
* Ela está aprendendo a tocar piano. (She is learning to play the piano.)
* Eles aprenderam a nadar na praia. (They learned to swim at the beach.)
There are other words that can be used in specific contexts, such as:
* estudar (to study, to learn formally)
* ensinar (to teach)
* descobrir (to discover, to learn something new)
The choice of the best word depends on the context and the specific meaning you want to convey.