Marketing is, or probably as broad as design.
In Marketing, there is, digital, analogue (old timer), personal, content creation, packaging, etc. Similar to Design too.
Marketing boils down to two basic concepts;
In most cases, a designer's task is to amplify marketing.
Before you can amplify, you need to understand the context, history and future of the materials provided. These questions have to be asked by yourself.
The two coincide with the user or target market.
We do marketing to attract the target market, we do design to make users stay. That's how Marketing works in Design.