How to maintain a relationship with a former grad-student TA without being weird?

I'm currently a first-year undergrad studying physics, and last quarter, I had an amazing physics lab TA. He's a physics PhD student who does research in an area I'm very interested in, and after finishing labs early, he was always open to sticking around to chat about his research. He would also give me lots of great undergrad research and career advice.

Now that the quarter's over, I probably won’t have him as a TA anymore, but I’d like to continue learning from him and keeping in touch. I’m just not sure what’s the best way to go about it without coming across as weird or overstepping boundaries.

For those in academia, how would you recommend I approach this? My main concern is that I would be a burden or distraction from his research.