I’m going to go over describing where something is today! Location words are very important. First of all you need to know the word “where” of course.
どこ = where
どこですか？= where is it? (literally where to be? it is implied. Depending on the context this could even mean where are you?)
Where is my cat?
The cat is on top of the desk.
うえ: on top of/above
います: to exist (living things. Excludes plants)
に: a particle that indicates what the location is
So it’s pretty simple! Here’s some other location words:
前（まえ）: in front of
ここ : here
そこ : there (near the listener, but not the speaker)
あそこ : way over there (away from both the speaker and the listener)
I’ll do one more example for the word “between” since the pattern is slightly different.
The cat is between the desk and the dog. So here’s the pattern by itself:
＿＿＿と＿＿＿の間にいます。Fill in the blanks with what you want your object to be in between. Also! If your subject is not a living thing do not end the sentence with います！ Use あります！