"Raj's school is in America."
Translation:राज का स्कूल अमेरिका में है।
I'm also a beginner, so bear with me please. I think that "ka" is for masculine and "ki" is for feminine objects. So in the phrase "Raj's school", you'd look at the noun "school" and figure out it's gender. School must be masculine, cos the answer here says "ka" (guessing backwards).
Btw, it would be really nice if a native speaker could confirm!
On how to determine gender: https://hindilanguage.info/hindi-grammar/nouns/gender/. At my basic level, all I'll remember is that: - many masc. words end with आ - many fem. words with ई
Please support a feature request to Duo that we see the gender of each word in the hints.
And a short note on nettiquette: dunno why someone downvoted your post - it's a question and all new questions are good!