A foundation course usually tackles the basics of something (in preparation for advanced books/courses)

If you need to say something like that then, generally speaking, it’s a good indication that your thoughts could have been articulated in a more amicable, constructive or acceptable manner.

Please remember that people creating educational content (as well as those making libraries, languages and frameworks) put a lot of time and effort into what they do, and so feedback is generally best provided as kindly as possible.

This part of your post in particular is concerning:

I am by default a hard critic and I apologize if I hurt you.

There’s no need to be a ‘hard’ critic. Please just be a ‘nice’ one. Thanks!

Thank you for your work on this forum, it’s become a great place for the elixir community. I’m currently working on more elixir content once my site / content is more ready I looking forward to becoming a sponsor of elixir forum.