How important is it to understand the social conventions of other countries?

I'd say understanding social conventions abroad is crucial, especially in professional settings where small missteps can create awkward situations. As a UI designer working with international clients, I've learned that even simple things like meeting etiquette or email tone can vary significantly. For example, when I first started working with a Japanese client, I didn't realize how important it is to exchange business cards with both hands - my casual one-handed approach probably seemed rude. That said, most people are understanding if they see you're making an effort, so while it's important, perfection isn't expected.