Hello can I share here my course video?
Given that you replied to a really old spam thread from 10 years ago, my guess is probably...no
That's, of course, because it got bumped up by some other bot whose post has already been deleted
That is how 99% of forum software works!!!
Can I post WordPress course here or no?
No. That is considered spamming - especially since this would be one of your first posts on the forum!