1. How can Excel users ensure the accuracy and reliability of data entered into spreadsheets, and what role does data validation play in this process?
2. What steps should individuals or organizations take to protect sensitive or confidential data stored in Excel spreadsheets, especially when sharing them with others?
3. Explain the difference between relative, absolute, and mixed cell references in Excel.
4. When is each type of reference useful, and how can they impact formula calculations?
5. What are the potential challenges and errors that can occur in data entry, and how can you identify and rectify these issues in Excel to maintain data integrity?