What is Brief?
A brief is the summary that guides the production of a piece of content: the topic, the audience, the goal, the tone and what cannot be left out. At an agency, it is the document the client hands over; for someone producing alone, it is the sentence that organizes the idea before opening the tool. A good brief is short and specific: "three mistakes beginners make advertising on Instagram, for shop owners, direct tone" yields more than "a post about ads". The better the brief, the less revision afterwards.