An h1 tag is used for titles and important subtitles. There are 6 versions of the 'h' tag. They are h1-h6

This is a paragraph tag. It is used for writing sentences and paragraphs. Paragraphs tags automaticlly insert a linebreak everytime they are used.

This is a span tag. It is also used for writing sentences and paragraphs, however span tags do not insert a linebreak everytime they are used. 
This is a pre tag. It is used to display pre-formatted text. Pre tags will keep the font family of the text.
An "a" tag is a link to a different web page.

Here's how to make a unordered list:

Here's how to make a unordered list:

  1. First thing
  2. Second thing
  3. Third thing

Div tags are used as dividers. You use them to seperate page/document sections.