"Ik ben goed bezig". I'm good busy. Now I know what that means, but at first, I didn't get it. When I just moved to the Netherlands, I could survive but I wasn't really ingeburgerd (integrated). I had no deep understanding of culture, society and mentality, let alone of official structures or unspoken expectations.
Nowadays I'm goed bezig: I speak Dutch. Or better said: I do my best.
More information: https://www.iamexpat.nl/read-and-discuss/expat-page/articles/why-learning-basic-dutch-is-not-enough-beyond-gezellig