We use an adjective to describe the qualities of people, things, places, etc.

Can you see the young woman at the end of the street?

We use an adjective (not an adverb) after 'linking' verbs such as be, become, feel, seem, smell, sound, look, etc.

It looks interesting.
His ideas are interesting.

We use an adjective to describe the object.

His answer made his boss angry.

She was too frightened to say a word.

Many adjectives are participle forms of verbs.
The -ed form describes how someone feels (bored).
The -ing form describes the person or thing that causes the feeling (boring).

I am very interested in this problem.

It was a boring film.

The camera works perfectly.

We use adverbs to say how we do something.

She married a tall, young, German lawyer.

Adjectives normally go in the following sequence: size-age-shape-colour-origin-material-purpose.