Vocabulary is important because ( my opinion) using betters words instead of saying something in a more simplistic way, shows you have more knowledge on what your talking about and just makes you seem smarter in general.
Promotion is a activity that supports or provides active encouragement for the furtherance of a cause, venture, or aim
Promoting is very important in marketing because it allows whatever product or information you are trying to get out expands across to different platforms and audiences.