"The languages referred to as "Bosnian" "Croatian" and "Serbian" are one common language, albeit with different dialects."--BBC
Serbian, Bosnian, and Croatian are all close relatives belonging in the South Slavonic group of languages. They are all mutual intelligible standard varieties of Serbo-Croatian language. Before 1990, they were languages of now dissolved former Socialist Federation of Yugoslavia(The area covers today's Bosnia and Herzegovina, Croatia, Kosovo(not recognized by Serbia and Serbs in Bosnia. They claimed it to be part of Serbian territory), Montenegro, North Macedonia, Serbia, Slovenia).
Bosnia and Herzegovina
Capital: Sarajevo, Population: 3.48 million, Area: 19.7 k sq m2
Portion of BCS: 50.1% Bosniaks, 30.8% Serbs, 15.4% Croats
Official language: Bosnian-Croatian-Serbian
Croatia
Capital: Zagreb, Population: 3.87 million, Area: 21.7 k sq m2
Portion of BCS: 91.6% Croats, 3.2% Serbs, 0.6% Bosniaks
Official language: Croatian
Republic of Serbia
Capital: Belgrade, Population: 6.6 million (excl. Kosovo),Area: 29.9 k sq m2(excl. Kosovo)
Portion of BCS: 83.3% Serbs, 2% Bosniaks
Official Language: Serbian
Of all the Slavonic languages, these are the easiest for English speakers to master, and are considered some of the easiest of all European languages for English speakers to pronounce.
IU offers a Slavic track major through Slavic & East European Languages and Cultures.
Online BCS courses are available in Language Workshop 2023.