Most good prompts contain four parts. Remember them as C-T-F-L.
Context
Who are you, and what is the situation? "I am preparing for a marketing internship interview."
Task
What exactly should the AI do? "Ask me five likely interview questions, one at a time."
Format
How should the answer look? "Wait for my answer after each question, then give two lines of feedback."
Limits
Any rules or boundaries? "Keep questions suitable for a fresher. Do not give model answers until I ask."
Put together, these four parts turn a vague request into a clear brief, and clear briefs get better results.