What did you do during your first couple months to get confident as a sales advisor?

I’m a new employee at Best Buy. I’ve probably worked about 3 weeks now. I’ve done a lot of independent research to learn about products but even with that, it seems like customers always have questions I don’t have the answer too. What did you do to learn more about products? Also what did you do in interactions where you didn’t have an answer to a customers question and how did you answer?