Best Way to Prepare for a Fundamental L/S Internship?

I am unbelievably fortunate to have recently received an offer for a Summer 2027 fundamental long/short internship at a multi-manager hedge fund. For context, this will be my junior year internship.

I have about 10 months before I start and want to use the time well. My background is mostly investing/finance with some TMT banking experience, and I’ll also be spending time at a smaller hedge fund before returning to school.

I thought I'd come to the source and ask actual analysts, and perhaps senior professionals too: if you had 10 months to prepare before starting, what would you focus on?

Interested in anything - reading, idea generation, modeling, investment write-ups, earnings work, shorting, building a process, or just general habits which separate strong interns from everyone else.

My main goal is to really show up already thinking and operating like a junior investor.

Would appreciate any advice.