BuddyPress.org

What would be better is if you created a page with video and tutorials, then you could use something like this:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/how-to-make-a-private-community/?topic_page=3&num=15#post-44729

Just change bp_core_redirect() to the page you want to redirect your users to if they’re not logged in.