Is Eingangstor der, die or das?

The correct German article for Eingangstor is das. The noun Eingangstor is Neuter. So you always say: das Eingangstor. Learn the article together with the noun — German nouns don't follow predictable gender rules most of the time.

The plural of Eingangstor is: die Eingangstore. In the plural, every German noun takes the article "die". So: die Eingangstore. Example: ein Eingangstor → zwei Eingangstore.

Correct: die Eingangstore. The form "die Eingangstors" is wrong. The plural of das Eingangstor is die Eingangstore. In the nominative plural, you always use the article "die".

das Eingangstor follows the four German cases. Nominative: das Eingangstor, Accusative: das Eingangstor, Dative: dem Eingangstor, Genitive: des Eingangstors. In plural: die Eingangstore / den Eingangstoren. Learn these forms together with the noun.

The genitive singular of das Eingangstor is: des Eingangstors. The genitive plural is der Eingangstore. German uses the genitive to express possession or belonging. Example: die Farbe des Eingangstors.

The dative plural of Eingangstor is: den Eingangstoren. In German, dative plural nouns usually end in "-n". So you say: "mit den Eingangstoren". Use this case after prepositions like mit, von, bei, zu.

Eingangstor is a noun and must be capitalized in German. You'll find example sentences above for each case. The article das stays the same in nominative singular but changes in other cases. Practice declension in your own sentences.

Yes, Eingangstor is a noun (also called a substantive). German nouns are always capitalized. The article for Eingangstor is das. Every German noun has a fixed article you must memorize.