What's the difference between writing a post versus writing a page?
This is an important terminological distinction to grasp. For posts and pages serve radically different functions. A post is an article that shows up in the chronology of your blog. In other words, posts appear in your blog, most recent at the top of the page.
A page is what most folks may be more familiar. This is a static space that is not part of the chronological logic of the blog. A page sits outside of this inverted time line, and often features more static content like information about the site, the author, a syllabus, readings, etc.