Are you trying to write a web page rather than a document?
Did you read the first link?


The Columns feature in Word is for newspaper-style, snaking, columns. Tables are for parallel structures. You can have heading styles in tables.

You can also have non-heading styles that look like heading styles. They will look like headings but not show up in the Navigation Pane nor in a Table of Contents. Why use Microsoft Word’s built-in heading styles? by Shauna Kelly