RewriteEngine on
RewriteRule ^index.html$ https://test.com/ [L,R=301]
RewriteRule ^index.php$ https://test.com/ [L,R=301]
RewriteRule ^profile.html$ https://test.com/free/profile [L,R=301] 
RewriteRule ^session.html$ https://test.com/free/session [L,R=301] 
RewriteRule ^workshop.html$ https://test.com/ [L,R=301] 
RewriteRule ^news.html$ https://test.com/free/works [L,R=301] 
RewriteRule ^contact.html$ https://test.com/contact [L,R=301]
RewriteRule ^$ https://test.com/ [L,R=301]

ErrorDocument 404 https://test.com/