Here's a breakdown:
* jaja: This is a common Spanish way to express laughter, similar to "haha" in English.
* un poco: This means "a little bit."
* de: This is a preposition that translates to "of."
* aprendizaje: This is the noun form of "to learn," meaning "learning."
So, the whole phrase suggests that the speaker finds the idea of learning somewhat amusing, perhaps because they're learning something new or because they think it's a bit silly.