This is the 862nd most frequent German word.
deutsch
"Deutsch" means "German" in English.
Here, 'Deutsch' refers to the German language as a whole, a proper noun.
Ich spreche Deutsch.
I speak German.
'Deutsch' is used as an adjective to describe the nationality or origin of the newspaper.
Wir haben eine deutsche Zeitung gelesen.
We read a German newspaper.
Again, 'deutsch' functions as an adjective, indicating that the type of grammar being learned belongs to the German language.