Be proactive, participate in meetings, ask questions, think about problems even if not explicitly asked for
Actively work to get hands-on experience in all parts of the research pipeline: build slide decks to outline ideas, present in group meetings, write paper idea abstracts, help in implementing prototypes and running experiments
Ask questions sooner rather than later when you get stuck
Pair with a PhD student on your first project to maximize your learning curve
Work in person and stay in the lab as much as possible to interact with people (e.g. lunch, random discussion) and understand how people work in the lab