French, because it was the only language offered at my school as a second additional language (English is my native language, and Afrikaans was my first additional language).
This year, though, Ukrainian was my main focus. I finished the Duolingo course and I've been listening to Ukrainian podcasts and reading articles.
The course is really short :( I'm going through the French one now and it has so many more activities and lessons.
It took me a long time to wrap my head around the "case" system for Ukrainian, and I still really struggle to pronounce "ะ" ๐คฃ