Here is a fun Sesotho Sa Leboa quiz. Northern Sesotho (spoken in the north of South Africa) and Southern Sesotho (spoken in Lesotho and the Orange Free State) are basically the same language. Don't let anyone tell you otherwise. They have differences, to be sure, but these are largely negligible and don't hinder a normal conversational exchange. And then each one writes certain sounds differently. If you run into words you don't know, use the online dictionary. Have fun.