There are quite a few sites that provide free Udemy coupons, but far and away the simplest is
https://www.real.discount/
https://couponscorpion.com
They seem to update throughout the day and frequently have between 50-70 new coupons daily, which is much over any of the opposite sites I've verified.
You can make things even easier for yourself by subscribing to the free push notifications on the location, and you will be instantly notified after they add new coupons.
Take a glance, and i am sure you will be satisfied. the location has saved me a lot of cash, and it's nice to own all the free coupons on one site. It means i do not should go searching around the internet on a daily basis to search out the coupons i would like.