der / ein (maskulin)
Among other things, here are some nouns, that always have the masculine gender
cars (der BMW, der Volkswagen)
alcohol (der Wein, der Whisky, etc. | exception: das Bier)
days & months (der Montag, der Dezember)
cardinal directions (der Norden, der Osten)
besides that, there are word endings that most often occur in masculine nouns
-er (der Drucker, der Zauberer, der Schalter)
-ling (der Schmetterling, der Lehrling | exception: words derived from English)
-ist (der Masochist, der Spezialist, der Altruist)
-or (der Generator, der Transformator, der Professor)
-ismus (der Faschismus, der Kommunismus, der Impressionismus)
Disclaimer: this is not an exhaustive list but merely a collection of the most important noun types and endings.
die / eine (feminin)
Among other things, here are some nouns, that always have the feminine gender
motorcycles (die BMW, die Kawasaki)
numbers (die Sieben, die Dreiunddreißig)
flowers (die Rose, die Tulpe)
ship names (die Titanic, die Queen Elisabeth)
besides that, there are word endings that most often occur in feminine nouns
-heit (die Bescheidenheit, die Krankheit, | nouns derived from adjectives)
-keit (die Möglichkeit, die Einsamkeit, | also nouns derived from adjectives)
-schaft (die Freundschaft, die Bereitschaft)
-ung (die Zeitung, die Umgebung)
-ion (die Diskussion, die Inspiration | latin based foreign words)
Disclaimer: this is not an exhaustive list but merely a collection of the most important noun types and endings.
das / ein (neutrum)
Among other things, here are some nouns, that always have the neuter gender
colours (das Blau, das Schwarz)
nominalized verbs (das Fahren, das Trinken)
nominalized adjectives (das Gute, das Schöne)
besides that, there are word endings that most often occur in neuter nouns
-chen/lein (das Mädchen, das Mäuschen, das Kindlein)
-um (das Eigentum, das Spektrum)
-nis (das Ergebnis, das Verhältnis)
-ment (das Instrument, das Parlament)
-o (das Auto, das Kino)
Disclaimer: this is not an exhaustive list but merely a collection of the most important noun types and endings.