With the template hierarchy fresh in mind, let's take a look at the structure of Underscores. Underscores is an advanced theme that follows the latest web and Wordpress development standards, and it uses DRY development practices aggressively. It is also in constant development, so what you see in this course may not perfectly match the current state of Underscores, but all the examples and techniques used in this course can be used regardless of when you downloaded a fresh version of this starter theme.
index.php for the main blog page, single.php for single posts, page.php for single pages, archive.php for all archive pages including categories, tags, and author archives.
From here on out, we'll be working with these existing files, add more files and remove others. Underscores is a starter theme in the truest sense of the term, and what we do with it and where we take it is entirely up to us, so let's get cracking.