Why Everything In Spanish Has Gender
In Spanish, every single object is either masculine or feminine. Even inanimate things like tables or computers carry a gender, which forces you to choose specific articles and adjectives to match them.
This system means Spanish speakers must constantly categorize their world through a gendered lens. Masculine is the default category, which often includes words for general concepts or mixed groups of people. While it seems strange to assign gender to a chair or a window, it is simply a grammatical rule for how words agree. Understanding this structure is the biggest hurdle for new learners who are used to gender-neutral objects.
Source: Grammatical gender in Spanish