How to hide a site from indexing?

Question

Search Engine Optimization

The site is still under development, therefore, there is now test data and I would not want anyone to get there at all. So /robots.txt of my site contains the following content:

and if you drive the domain into search engines, they find the main page. Until recently, Google also showed several pages from the site, now only the main one. I understand that the robots do not work or is this a normal situation? Making access to the site by ip is not an option, because I have a regular dynamic IP address at home

Answer 1

Make authorization at the server level. No one, including the PS, will be able to access the site without a username and password.

Answer 2

Make a website on VUE - and Google and Yandex will see only an empty skeleton)))