1: Avoid using red food coloring in nectar as it can be harmful to hummingbirds.

2: Do not use honey or artificial sweeteners in nectar as they can be harmful to hummingbirds.

3: Ensure nectar is always fresh and clean to prevent harmful mold growth.

4: Maintain a clean feeder to prevent harmful bacteria and diseases from affecting hummingbirds.

5: Do not use pesticides or chemicals near feeders as they can be harmful to hummingbirds.

6: Avoid placing feeders in direct sunlight as it can cause nectar to spoil quickly, harming hummingbirds.

7: Do not use dirty or contaminated water to make nectar as it can be harmful to hummingbirds.

8: Keep feeders away from windows to prevent harmful collisions with hummingbirds.

9: Regularly clean and inspect feeders to prevent harmful buildup and ensure hummingbirds' health.