How NOT to get indexed?

I'm creating a website that I don't want to get indexed. Well, actually I want the main site, mysite.com NOT indexed and I'll make a blog as a sub-domain (blog.mysite.com), which I DO want indexed.

There is a feature in WP settings to Discourage search engines from indexing this site. However, can I be sure that if I tick this, the site will definitely not be indexed?

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