The robots.txt file is a simple text file placed on your web server which tells webcrawlers like Googlebot if they should access a file or not.

Improper usage of the robots.txt file can hurt your ranking. The robots.txt file controls how search engine robots see and interact with your webpages.

This file is mentioned in several of the Google guidelines. This file, and the bots they interact with, are fundamental parts of how search engines work.

HTML defines six levels of headings. A heading element implies all the font changes, paragraph breaks before and after, and any white space necessary to render the heading.

The heading elements are <H1>, <H2>, <H3>, <H4>, <H5>, and <H6> with <H1> being the highest (or most important) level and <H6> the least. They are used to help users and search engines to read and understand text.

For example, they act as signposts for the readers and make it easier for people to understand what a post or page is about.

Headings also define which parts of your content are important, and show how they're interconnected.

They are one of the key signals, along with many others, used by Google's search algorithm.

Here are some heading tags best practices.