Hi good morning ,can you please tell which issues you are facing ?
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1. well yes the assignments are visiable to all users but only logged in and user who are subscribed to course can do the assignments .
2. please refer :
https://www.elegantthemes.com/blog/tips-tricks/how-to-stop-search-engines-from-indexing-specific-posts-and-pages-in-wordpress
3. Please follow :
https://wordpress.stackexchange.com/a/281510
4. you can disable bbpress plugin to disable forums completely .