<!DOCTYPE html>.<html> and ends with </html>.<body> and </body>.Defined with the <h1> to <h6> tags.
h1 is biggest
h2 is smaller than h1 and so on..
defined with the <p> tag.
defined with the <a> tag.
The link's destination is specified in the href (Hypertext REFerence) attribute.
Syntax:
<a href="Link">Text</a>
<img> tag
Attributes:
source file (src), alternative text (alt), width, and height.
Syntax:
<img src="Image Location" alt="Name" width="Number" height="Number">
Width and height specify the image size in pixels.
Alternative text is used when an image cannot be displayed.

<button> tag
<button>Text on button</button>.
defined with:
<ul> - unordered/bullet list<ol> - ordered/numbered listfollowed by <li> - list items tag.
Syntax:
<ul>
<li>List Item</li>
</ul>
For ordered list replace ul with ol.
It is also possible to nest ordered and unordered lists.
Unordered List
Ordered List
<br> tag.
It has no end tag or closing tag </>.
HTML elements with no content are called empty elements.
Example:
There is line break
here.
Note: HTML tags are not case sensitive: <P> is same as <p>