Ask HN: What are some educational resources for more senior engineers?

I recently had a more junior coworker take an AWS Solutions Architect course, and I realized I am missing out on my company's personal development resources, but I am not all that interested in an AWS Solutions Architecture course, in part because a) I don't want to, and b) I know a bunch of AWS stuff by now anyway

So I am curious what are some interesting educational resources for people in more advanced engineering roles? Courses or resources that might help one move to an Architect or Principal/Staff role?