Understand the choice
Species is a botanical identity, such as Coffea arabica. A cultivar names selected planting material. Origin describes where the coffee was grown, while a brand identifies the business selling it. These can all appear on one bag without being interchangeable.
Put it into practice
Start a record with separate fields for each. If a bag says only “Colombia”, leave the cultivar unknown. If it says “Bourbon”, still ask which producer, harvest and process it refers to. Unknown is more useful than a guessed label.
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.