This is a bit confusing, so I decided to make a video on it.
Head- This is where you put information about the page and can place external/embedded stylesheets and script tags. Title tag and meta tags are included in this section. This is not part of the Body, so you would not place any content here.
Header- This is a new HTML5 tag that replaces div id = "header" or div class = "header". It's basically a way to make a header division in a page.
Heading- This is a way to alter text to make it a heading inside of a document. h1 is the largest (highest level) heading and h7 is the smallest (lowest level) heading.
![](https://i.ytimg.com/vi/sptTVoBi4sk/maxresdefault.jpg)