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The general rule of noun-adjective agreement in Spanish is simple: Singular nouns are accompanied by singular adjectives, and plural nouns are accompanied by plural adjectives. Masculine nouns are described by masculine adjectives, and feminine nouns are described by feminine adjectives. In other words, the adjectives chosen to describe nouns must match in both number and gender.
Generally, the "normal" form of adjectives, the form you will find listed in dictionaries, is singular and masculine. To make the adjective plural, follow one of these steps:
Important note: Invariable adjectives don't change in form and are very rare. Most of them are either uncommon colors or words of foreign origin. An example is web as in la página web (the web page) and las páginas web (the web pages). As a beginner you will seldom have the need to use invariable adjectives, but you should be aware that they exist so they don't confuse you when you see them.