how to Fix Chrome Tag my site as Dangerous
is your website available via http or https? Chrome does mark every http-website as dangerous automatically. You need https.
You need to configure your site to use SSL. For that you need to setup the server properly and get a SSL certificate. There are some services that allows you to create your own certificate for free, but not every hosting provider accepts them. In some cases you need to buy the certificate from your provider.
The most popular free certificate site is Let's Encrypt. You can read more on how to configure it on their site: https://letsencrypt.org.
Start with reading this: https://letsencrypt.org/getting-started/
You can read why google marked this site as Dangerous in this article click here.
If you are using WordPress in your registered domain then contact your hoisting provider about this issue. But if you are using free sites then I would recommend using XAMPP (Localhost) or you can use website like Pantheon to install and use WordPress.
If you face problem on how to use this site then follow this YouTube link to learn how this site works. It will start at 5:31.