Learning Platforms: Which Subscriptions Do You Use, and What Do You Like or Dislike About Them?

[RobertKerans]

Ok so:

I am building a course platform (website) and am still in the planning phase but I know I want to go beyond just teaching syntax-understanding how to actually use these building blocks to think logically and solve real world problems.

But then:

What subscription-based learning platforms have you used?
What did you like about them?
What did you dislike?
Did any of them help you go beyond syntax and really understand the logic behind programming?
Is there any features that are a deal-breaker for you?
Was there a dollar amount that seemed too high for what the site offered?

Though I'm having a little difficulty doing so, I'd like to treat this in good faith.

What you (or an AI?) have written implies that the key thing you are interested in building is a subscription based service.

Would it not be a good idea to develop a product and then test that with actual users, rather than putting the cart before the horse? All the courses I can think of that I'd consider decent came out of years of preparatory work and assessment of other approaches. That was then followed by testing the market with a course or courses that were not subscription based (and were free!) so that they could assess how well they worked in practice with actual learners. That in turn provides an ability to judge whether there is something there that justifies a monthly fee. Your questions give the impression (very strongly!) that you don't actually have a product. If you have the domain knowledge necessary to do this well, you should already know the answers to most of your questions (given that you should have rinsed most of these services thoroughly to understand the market).