Wrapping my head around twig calls

I jumped in head first the other day and I'm finding myself a little lost as I try to piece this together.

I'm in the process of creating my own template (actually converting a template from Templated that I liked the look of.) When I call {{ post.content }} nothing shows up. I discovered if I call {{ content }} I can get the content of the post (I started with the Blog Site skeleton as a framework.) But I can't get {{ page.title }} or images to show up.

As I try to figure out what the antimatter theme is doing for the blog parts, it's easy to get lost. What am I missing?

Okay, after playing around for it a bit more, I'm realizing that the page is loading item.html.twig, and I was thinking it was loading a different template page.

I think everything just clicked. I think I got it now. Thanks all!