Is requesting positive comments from friends and posting a fictitious comment on a paid educational course considered cheating and deception? And what is the correct Islamic ruling in this situation, knowing that the course has genuinely impressed other participants who posted real positive comments?

It is not permissible to post fake comments or request comments for complimentary purposes, as this constitutes deception by giving visitors the impression that there are unreal admirers. It is permissible to request viewing the course and writing opinions if they wish. If it is not possible to delete complimentary comments, the embarrassment can be removed by writing something indicating that a certain number of comments are incorrect.