How can I prevent circular reference errors from occurring in the first place?

To prevent these errors: 1) Carefully review all formulas before entering them. 2) Use the Formula Auditing tools (Trace Precedents/Dependents) regularly to check for potential loops. 3) Use absolute references ($) where needed to avoid unwanted changes. 4) Validate formulas after making changes. 5) Break complex formulas into smaller, manageable parts for easier debugging.