Gender belongs to the noun
A grammatical gender is not a claim that an object is male or female. Learn a short pair, such as o copo or a cadeira. The article gives you a useful reference for the agreement you will later need with adjectives and other words.
É uma cadeira.
It is a chair.
Definite does not simply mean previously mentioned
A definite article can identify something through shared context, even on its first mention. If both people know which chair is meant, a cadeira is appropriate. An indefinite article introduces an example without requiring the listener to identify a particular one.
É a cadeira da sala.
It is the chair from the room. The phrase after the noun helps identify it.
Why the ending cannot do all the work
Many nouns in -o are masculine and many in -a are feminine. Yet o dia is masculine and a mão is feminine. Keep these article–noun pairs rather than inventing a new spelling rule from the exceptions. Also remember that some constructions, including bare professions after ser, do not require an article.
O dia é importante.
The day is important.
Practise, then recall it later
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References and scope
Original explanations and examples informed by grammar references. The level assignment organizes practice; these short tasks do not certify complete CEFR proficiency.
- Português para principiantes — Lição 1University of Wisconsin–Madison