In Paris, we were a large, international team with people from France, Germany, Spain, Italy, Poland, and Portugal, while my friends were German, French, English, American, and Swedish. It taught me to live and work in international environs and brought me face-to-face with the widest variety of philosophies and approaches. It also showed me how to see my own culture from a different perspective.
For example, a part of my work was to adapt French marketing campaigns to a German target audience and sell a French product to German customers.
Then, as a freelancer, I managed online marketing campaigns for France, Spain, USA, and Mexico, which meant I had to consciously examine the differences between the various countries—like one and the same keyword generating a four times higher cost-per-click in the USA than in Germany, or the massively different demand situation for a product in France, England, and Germany.