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By selecting cells that only contain text, you can distinguish between cells containing different types of data, which allows you to delete, fill or lock cells by type.
Technique 1

1. Press F5, or choose Edit, Go To…;
   
2. In the Go To dialog box, click Special.
   
3. In the Go To Special dialog box, select Constants.
   
4. Click OK.
   

Technique 2 - Conditional
Formatting

1. Select the data area.
   
2. From the Format menu, select Conditional Formatting.
   
3. In Condition 1, select Formula Is.
   
4. In the Formula Box, enter the formula =Istext(A1).
   
5. Click Format..., choose any format from the Format Cells dialog box, and click OK.
   
6. Click OK.
   

Screenshot // Selecting cells that only contain Text in Microsoft Excel