What is the difference between slogan and attributive?

You are talking about the difference between predicative and attributive.

The difference between them is huge.

Let me give you a few examples:

Exposition:

Tom is [ a student.]

Tom is [at home.]

Tom is [reading.]

Tom is [tall.]

Tom is [clever.]

Attributive:

Tom is a [good] student.

Tom is a [great] swimmer.

Tom is a [honest] boy.

The words marked with "[]" are predicatives and attributives respectively.

Predicatives express the attributes of a person. It can be used as a noun, gerund, adjective, etc.

The attributive is usually used as an adjective (except of course the attributive clause), and is usually placed in front of the noun to be modified.

Read more examples in the book, understand them carefully, and you will definitely be able to distinguish them.