Water

Water in kitchen is double edged sword. You need water to wash things. You need water for certain type of dishes. You need water and salt to remove unwanted flavors from raw ingredients. You can use hot water to remove bad smells.

You also want to remove water. Remove water before ingredients goes into your dish. Remove water on cutting board before cutting the next ingredients. Remove water on the knife so it stays sharp. Remove water on all surfaces so things do not go stale.