Its very important that you read the design brief carefully and patiently.
Winners usually read it 3 times as well as discuss it with others. And don't hesitate to ask questions in the comments section. Contest holders will always help you create the best entry!
The design brief specifies exactly what a contest holder wants. Its your guide to creating a design which contest holder expects. It will contain all the information about their business, industry, target audience, preference of colors, fonts & styles. Sometimes contest holders upload documents or images for your reference, so make sure you check that.