TDL: Top Level Domain
Consider your name, using your own name makes it easier to apply for jobs. Naming conventions suggest that you always use all lower case. Mixing upper and lower is considered really bad practice.
HTML is not a programming language - Hyper Text Markup Language. It is a basic text document.
CSS: cascading style sheet.
Anatomy of a Tag:
<h1></h> Heading
<p></p> Paragraph
Block Level Elements:
<head>
<header>
<footer>
Why HTML/CSS?: