#1 Don't go looking to clear your doubts with your mentor. Instead, try and figure everything on your own. Trust me, that'll teach you a lot more than you think rather than by getting the answers directly spoon-fed to you from your mentor.

#2 Always keep a curious mind if you want to achieve something in what you do. You can't learn anything if you don't have the curiosity to ask the right questions - why? (mostly). Especially if you're just starting your career.