I have a WordPress website (eg example.com) which is basically a blog with weekly educational posts about a specific subject. I also have a subdomain (eg courses.example.com) which offers online courses about the exact topics I write about in my blog.
I want to put a link (courses.example.com) on my every blog post on my main example.com site. Will it hurt my SEO for every one of my posts on example.com to link to the courses.example.com?
If yes, is there any recommendation?