Gender

Masculine nouns:
Nouns referring to male people and animals are masculine:
der Mann (man)
del Löwe (male) lion 

Seasons, months, days of the week and points of the compass and masculine:
der Sommer (summer)
der August (August)
der Freitag (Friday)
der Norden (north)

Most nouns referring to things that perform an action are also masculine:
der Wecker (alarm clock)
der Computer (computer)

Nouns with the following ending are masculine:
-ich  > der Teppich (carpet)
-ig  > der Essig (vinegar)
-ling  > der Frühling (spring)