CSS

Schema markup is metadata for a web page that can define certain attributes of that page. It helps categorize and define site attributes for search engines. It is sometimes referred to as structured data.

Keyword stuffing is a “black hat” SEO technique, wherein sites will “stuff” a webpage with words on a topic they’d like to rank for, but without concern for the usability, accuracy or informational value of the page.

This practice is frowned upon by search engines and can damage your search rankings if you engage in it.

301 redirect refers to a code sent by a website’s hosting server to a browser. In practice, it means you’ll get redirected to a new page when you input the old URL.

For website administrators, 301 redirects shouldn’t be used in excess, but can be a good way to deliver relevant pages to users when the original page has been removed or the content has been merged into another page.

From an SEO perspective, the old page’s ranking will transfer to the new page.