Problem
I’m using the Fluent Community plugin, but I’m facing a big issue — when I add my course using an unlisted YouTube link, it’s not secure at all. Please tell me a way to make my course secure so that only logged-in users can access it.
What do you mean by "not secure at all"? You may make your course Private, where only students can access the course.
Youtube links are always public. Use Vimeo or Bunny if you want to access only by your domain.
That's why you should never put your course materials on YouTube. They're hidden but public. Vimeo and Wistia are good alternatives. I personally use bunny.net. It's cheaper.
There is an option to upload it directly to wordpress