Advice to someone starting an internship

[u/meep4444]

What advice would you give to an intern who's about to start working in a pretty big company abroad (in Europe, specifically, where the local language can be a bit of a barrier)?

I'd also like to know what are the most common things that interns do that just pisses people off, and must be avoided at all costs.

Edit: The firm is involved in the engineering & architecture industry