I've been working on 3betting in my game lately. But I'm having a hard time in certain spots. For example,

UTG 60bb opens 2x
Hero UTG1 30bb AJo

Calling here seems like a big mistake. However, I don't know if I like a 3bet either. But the real problem is I don't even know how to go about figuring it out. I feel like I'm missing some fundamental part of the game that I overlooked early on in my studies.

Any help is appreciated. Thanks!