I'm creating an article website and am having a time translating my page hierarchy into WordPress. Here's a small flow image for context:
The first page you choose a category, followed by a sub-category, finally to the first article of the series. Here's an example of what a breadcrumb might look like:
Mathematics > Algebra > Variables
My original thoughts were to have a page using the archive template to show first-level categories > another page with all sub-categories of selected category > the first post inside of that sub-category, but I can't get it working right. Any help is genuinely appreciated.