The Flemings (northern part of Belgium) are speaking Dutch, the Walloons (southern part) are speaking French.
The Fleming are learning French first, because even though the Walloon are a minority and not as developed economically its important for the unity of the country to make effort to understand each other. They are learning English in second.
The Walloon don’t care about the Fleming, learning dutch for them is not a priority. They are learning a bit of English and only few very motivated Walloon are learning Dutch
I love Walloon, they are probably the friendliest people I’ve ever met but the love/hate with the Fleming is interesting.
A funny experience is to take a train from Liege to Brussels. Liege is is Wallonia so announcement are only in French. Then we pass through Leuven in the Flanders so now all announcement are only in Dutch even though we are still the same train. Finally we arrive in Brussels so announcement are made in 2 language.