There are a few ways to lock a column in Google Sheets. The first way is to select the column you want to lock and then go to the "Data" tab and select "Protected ranges." From there, you can select the locked column and choose "Protect range." The second way is to select the column you want to lock and then go to the "Format" tab and select "Protected ranges." From there, you can select the locked column and choose "Protect range." The third way is to select the column you want to lock and then go to the "Review" tab and select "Protect sheet." From there, you can select the locked column and choose "Protect range."