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Adjective-noun agreement
An adjective is a word we use to give more information about a noun: bello (beautiful), felice (happy), divertente (funny)...

Adjectives agree in gender and number with the noun they modify.

There are two main types of adjectives, as listed in the dictionary: those ending in -O and those ending in -E:

Adjectives follow the most common pattern of noun endings:
When an adjective modifies two or more nouns of different gender, it keeps its masculine ending:
Invariable adjectives

A few adjectives are invariable; that is, their ending does not change. The most common are some of the color adjectives: blu (blue), rosa (pink), and viola (violet, purple).