How to make a redirect from the pages to the main page of the site?

Question

Apache HTTP Server

Good afternoon!
There are old addresses like:
site.com/blah
site.com/blah-blah
site.com/blah-blah-blah
How do I redirect them to the main page of site.com through .htaccess?
But there is one condition , addresses that contain subfolder data:
site.com/folder-one/...
site.com/folder-two/...
site.com/folder-three/...
do not participate in the redirect should.

Answer 1

RewriteRule ^folder-(one|two|three) - [L]
RewriteRule .*? / [R=301]