Hey @EsraaKamal21, sorry to hear this! The best thing to do when you find something like this is to submit a takedown request with our partner Link-Busters who can act on your behalf to request that your course is removed from these sites.
Link-Busters typically successfully gets the Google Search result removed so it's harder for people to find these pirate sites and download your course. Unfortunately, it's harder to ensure that the actual pirate sites remove your course because they tend to ignore DMCA requests.
Hope this helps clarify what's going on! For more information about Link-Busters, check out this article: https://support.udemy.com/hc/en-us/articles/229604108-What-Should-I-do-if-I-Find-a-Course-on-a-Pirat...
some people buy my course free or .5 dollar .. i dont know how i prevent them .. they steal it and increaze in discount by thier deferent ways
Please clarify what your exact issue is? Is it piracy as mentioned by @Abbie? Or is it the fact that people get your course at low prices?
In the latter case, this is due to the settings of your instructor profile. See https://support.udemy.com/hc/en-us/articles/229232827-Instructor-Promotional-Agreements-and-Udemy-De... for more info.