Some people forget to create a “coming soon” message for their website while they are building it and the problem with this is that people could find the URL or somehow see the content you have and if the work is not finished this could keep them from coming back.
The best thing to do is to create a coming soon page and you can do that by typing “under construction” on the plugin search. This will take you to a few options that offer plugins for this sort of page to be displayed to visitors. You will see the site normally if you are logged in to the control panel, but visitors will see the coming soon message instead.