How can one obtain reviews for a Udemy course?

You have to offer your course FREE to your close friends and family members first. Or you can share free coupons on your social media for random people as well. Ask them to take your course and give honest reviews. Then you can improve your course on the basis of that feedback.

After there are some reviews present on your course, students will automatically come and enroll into your course.

I have tried and this works.

Also, the 5 star or 4.5 star rating does not matter. Its actually THE NUMBER of reviews that matter, even if its 3 star or 4 star.

I hope it helps.

Thanks.