Can I recommend commercial training?

I have been working through a training session on Udemy. The multi-hour course costs money, which is no surprise, but it is absolutely the best ground-up starter training for Krita that I have found in my long trek through YouTube and other Krita training resources.
Can I post a recommendation, or is promoting a commercial venture restricted? I think it would be a great benefit for any new Krita user who is even slightly computer literate.
Thanks for your views.

Sure if it is Krita related you can make a post in tutorials and resources category. But mark it as paid resources in the title or in the body of the post.

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