- Browse the free course list.
- Click Enroll Now Free — opens Udemy with the coupon applied when possible.
- Check the price shows Free / $0 / 100% off.
- Add to cart and complete checkout (total should be zero).
- Find the course under Udemy → My Learning.
Note: Coupons can expire or hit a redemption limit (often ~1,000 uses). If a course is not free, the coupon is gone — pick another.