This may seem like an irrelevant piece of advice, but always eat lunch away from your desk. It can be tempting to just sit at your desk and stay out of the way, but it’s worth it to go sit with everyone else. Lunch is a time where you can talk to people that work in different departments and people are usually pretty relaxed. You get to know more about the people you work with and they get to know more about you without it always being about work.