What are some effective techniques for creating a visual hierarchy in graphic design, and how can they be used to improve the overall impact and readability of a design?
What’s the context of the question?
Starbursts – neon green preferably. Make logo pop. Lots of copy.
That’ll be a good start.
Sounds like homework. Maybe ask ChatGPT? 
Let me try to answer this question without a whole lot of context, in short: the most important elements should appear to be the most important.
This is a good example, of the distinction:
Use positioning, scale, line and colour accordingly so to give the emphasis to what’s important.