How would one code a page that shows a randomized product block or blog entry?

Hi, here's a brief description of the experience I'm hoping to create:

• Visitor goes to a page where you they see a random post.
  • Posts have the following components
    • Post ID
    • Media (text, image, livestream, video, music, etc)
    • Source Link (if applicable, opens in new tab)
    • Backlinks  to associated posts
    • Tags - each navigates to a randomized associated post
• From there, the visitor can only navigate using the links and tags within each piece of content.

Ideally, I would like to upload posts as MD files and just have the page display one of those at a time. If that's not possible, it seems like I could use blog pages or maybe product blocks to achieve this same thing (I would just have to take all my MD files I already have and input them one-at-a-time... which would suuuuuck).

My questions are:

• Is there a way to make a page that just shows a randomized post?
• Is there a way to make said post be a markdown block that pulls from an archive of markdown files?
• How would I make a tag link point towards a randomized post with that tag?