grammar.nouns.gender-endings
Guessing gender from the ending
-o is usually masculine, -a usually feminine; -ción, -sión, -dad, -tad, -umbre are feminine; -ma (Greek origin), -or, -aje lean masculine.
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Explanation
The ending of a noun is a strong (if imperfect) clue to its gender. As a baseline, -o is usually masculine (el libro, el dinero) and -a usually feminine (la casa, la mesa), but the more reliable signals are certain longer endings.
Dependable feminine endings: -ción/-sión (la nación, la decisión), -dad/-tad (la ciudad, la libertad), -umbre (la costumbre), -ez (la vejez). These are almost exception-free and cover a huge amount of vocabulary.
Dependable masculine endings: -aje (el viaje, el paisaje), -or (el color, el calor), and most -ma words of Greek origin (el problema, el sistema, el idioma, el tema). The handful that break these patterns is short and memorizable, see the gender exceptions rule.
Examples
The information arrived late.
Region: global
The official language is Spanish.
Region: global
The information about the trip arrived late.