Taking the following example:
- Ich gehe in der Stadt.
- Ich gehe in die Stadt.
I couldn't understand when to say
in die Stadt and when to say
in der Stadt.
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"Ich gehe in der Stadt" is for when you are already in the city and walking around there opposed to
"Ich gehe in die Stadt" is for when you walk to the city.
Ich gehe in die Stadt
I go to the city
Ich gehe in der Stadt
I am walking in the city
As @Ralf Joerres stated
Ich gehe in der Stadt is gramatically not entirely correct, as the verb
gehen with the meaning of
to walk somewhere always asks for a
So as @Takkat stated, if you don't want to change the meaning of the sentence, you could say
Ich gehe in der Stadt herum, which means to walk around in the city.