Understand the choice
Ask for species or variety information where known, origin, processing, harvest and storage history. Start with an amount that fits your equipment and learning pace. Record the green and roasted masses to calculate roast loss.
Put it into practice
Use a roasting device according to its manual with appropriate ventilation and fire precautions. Roast-loss percentage is a weight measurement, not a complete roast-development assessment.
Keep the conversation useful
Share your actual recipe or experience, identify the coffee or equipment and explain what changed. A clear question with measurements makes the discussion easier for others to answer.