Using Data validation rules the drop-down feature allows you to create drop-down lists within your Google Sheets. We use them to mark off availability for example:
This opens the 'Data validation rules' box and you can select the range you would like this to apply to (where you would like your drop-downs to go), you can also colour-code them to make them easier to view.
Further tip: If you click the advanced options you can change the look of the drop-down list, we have gone for the modern chip look but you can choose from:
A simple and quick way to create your drop-down lists in Google Sheets!
For more tips click here!