i could teach you some prepositions:
over/above: über
under: unter
next to: neben
in front of: vor
behind: hinter
between: zwischen
in: in
with these sentences you can describe easily where something is.
for that you need the dative of the noun.
luckily the word doesn't change its ending. only the article changes.
if the article is: die (female) it changes to der
if the article is: der (male) it changes to dem
and if its: das (neutral) it changes to dem, too.
ill describe now where the bird (vogel) is

Haus is neutral, so the articles changes to dem. / Baum is male.)
Der Vogel ist über
dem Haus (house).
Der Vogel ist unter
dem Baum (tree).
(Eiche is female, so the article changes to der.)
Der Vogel ist neben
der Eiche (oak).
