The Gutenberg editor has revolutionized how we write in WordPress.
Gutenberg didn't only change how we write posts, but it also exposed many more WordPress features. In the old, "Classic" editor, you had a formatting toolbar that looked like Microsoft Word. In Gutenberg, you have the formatting options, but also easy access to extra features. Two of those new features are Widgets and Embeds. These are WordPress features that were previously very difficult to access when writing posts.