What is the best practice to avoid error 1004 when referring to worksheets by name?

The best practice is to explicitly qualify your references to worksheets. Instead of relying on the active sheet, use `Sheets("YourSheetName")` or `Worksheets("YourSheetName")`. Furthermore, consider using `With` statements to group operations on a specific worksheet, like `With ThisWorkbook.Sheets("DataSheet") ... End With`. This reduces ambiguity and the likelihood of referencing the wrong sheet.