Hi friends,
There are many websites that give you coupons for courses in udemy, most of these websites don't delete expired coupons, so you need to navigate and test a lot of coupons to find a valid one, but this website that I will share with you do that for you, he shows only valid coupons for you and updates daily, each day between 10 to 30 courses are added, you can subscribe via email to get notification of new courses.
Website Name: Giveaways Networks
Free Courses Page: https://giveawaysnetworks.net/Udemy
That's all, Thank You