Grammar JLPT Level N5 - Lesson 7

Structure of な-Adjective + (Noun):

［な］Adjective + な + Noun

Examples:
静(しず)か + な + 夜(よる)
元気(げんき) + な + 子供(こども)

Details about な-Adjective + (Noun):

In Japanese, almost any type of word can be attached to the beginning of a noun to modify the meaning, or describe the qualities of that noun. However, depending on the type of word used, conjugation rules will differ slightly.
For な-Adjectives, they will always need to be followed by な, when used before a noun. This means that adjective (A) is describing qualities/features of noun (B).

カーテンオタク：これは綺麗(きれい)なカーテンです。
A curtain enthusiast : This is a pretty curtain.
元気(げんき)な赤(あか)ちゃん。
A healthy baby. ('Energetic' or 'spirited' would also be accurate translations)

な-Adjective + (Noun)

Usage Notes for な-Adjective + (Noun):

Many words can take either な or の when describing a noun. The difference in meaning is usually clear. Let's take a look at both nuances.
(A) な (B) means that - (A) is a quality/feature of (B)
(A) の (B) means that - (A) is the type/purpose of (B)

有名(ゆうめい)な人(ひと)。
A famous person. (A 'quality' of this person is that they have 'fame')
有名(ゆうめい)の力(ちから)。
The power of fame. (The 'type' of power is that of 'fame')

To avoid making this mistake when using な-Adjectives to describe a noun, it can be helpful to think about whether you are describing a 'quality', or the 'purpose' of something.