The basic tags which are necessary.
Example codes and Outputs:

Input:

Tags used:

Body tag/content-tag.
Head tag/content-tag.
Paragraph tag

Input of example:

Output of example:

Attribute

Description

Background color

Background color changes the color behind the text written inside the body tag and, *it must be written in body tag only*.

Background image  

It's easy to add backgrounds in photos but is it easy in HTML? *Yes?* Yes Just add 'background="location of your image"' to your body.