You have a few options. You can prepare it locally, and then upload and publish. Or you can restrict SE bots via robots.txt. Or just replace index.html for construction period. Or allow access to blog for your IP only via .htaccess file, or use password, etc.
You can use maintenance mode. If you use WP you can find plugins for this, for example: https://www.sourcewp.com/best-wordpress-maintenance-mode-plugins/
I'm sure you will find solutions for other CMS too.
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