This is the 11192nd most frequent Polish word.
graniu
"Graniu" is the locative or dative form of the Polish noun "granie," which means "playing" (typically referring to playing music, games, or acting).
In this sentence, 'graniu' refers to the act of playing games, used as a noun in the instrumental case to indicate the activity taking place while another activity (listening to music) is occurring.
Lubię słuchać muzyki podczas graniu w planszówki.
I like listening to music while playing board games.
Here, 'graniu' represents the noun form of the activity of playing the guitar, in the dative case, showing a habitual action benefiting the skill.
Codzienne graniu na gitarze poprawia moje umiejętności.
Daily playing of the guitar improves my skills.
In this example, 'graniu' is used as a noun in the prepositional case, referring to the activity of gaming, with 'w' specifying the context of computer-based games.