Is the time when page's primary content appeared on the screen. This is going to be the primary metric for user-perceived loading experience.

An evaluation of a number of factors, including the relationship between page speed and potential conversion rate from a mobile device perspective.

The Accelerated Mobile Pages (“AMP”) Project is an open source initiative that came out of discussions between publishers and technology companies about the need to improve the entire mobile content ecosystem for everyone -- publishers, consumer platforms, advertisers, creators, and users. Today, the expectation is that content should load super fast and be easy to explore. The reality is that content can take several seconds to load, or, because the user abandons the slow page, never fully loads at all. Accelerated Mobile Pages are web pages designed to load near instantaneously -- they are a step towards a better mobile web for all.

PA is a score developed by Moz to predict how well a page might rank on search engines based on many factors like backlinks, trust, relevancy, spam, etc.

This is the amount of words found on a website page. The goal is to have a minimum of 700 words of killer content but may be more if your competitors are doing real content marketing..

By giving your readers an estimated read time you set the expectation of how much time users will need to view your content, thus allowing them to set that time aside just for you.

The Flesch–Kincaid readability test are designed to indicate how difficult content in English is to understand.

The spell checker test is designed to interpret your content as a search engine to highlight potential issues with words that are misspelled or misinterpreted.

It helps users with relevant text that resonates with what they are searching and interested in.

When a website has an https:// in front of its web page url it is providing an encrypted link between its web server and your browser for security. Having an SSL definitely improves trust by users and search engines alike and is a must!

Its an HTML element tag that tells search engines that this is the preferred version of a web page so that it doesnt think the www.yoursite.com is hosting duplicate content on yoursite.com.

Website errors not only affect the usability and user experience it will affect your rankings as your bounce rates increase and the time between when a user clicks on a result, and when the user returns from that search engine results page

Besides higher conversions, dwell time increases which improves search engine ranking positions.

The title tag is the HTML element used as the headline for you web page on search engines. Your target keyword should be found here.

Where you main content of the web page is found.

The meta description tag is summarized the page and placed in the head section of your web page. Its used by search engines listed on the result pages. You'll often hear people saying its 160 characters max but a simple Google search proves this wrong. I've seen up to 286 characters.

The h1 tag is the most important heading tag in your HTML because its the main headline for your content.

A redirect is when you attempt to open a URL but directed to a different page. It leads to a poor user experience and looks very unprofessional.

The alt attribute is used in an img tag and is the alternate text for an image that can't be displayed for any reason or in screen reader accessibility for people who are blind. This tag is not meant for keyword spam, use it to provide detailed data about the image.

Its a website URL/link that points to another website.

Its when a website has posted a URL of your web page on theirs and search engines see this as a vote for scoring a web pages ability to rank for certain keywords and content.

The more your website appears on social media the more your page is in front of others who may visit and use your website which leads to an increase in brand awareness and overall popularity.

Metadata^{(Data About Data)} tags that provide clues about the meaning of a pages data and type.

Twitter markup tags are added to the head of your html. It provides you with the ability to optimize your pages content for Twitter sharing to help promote your web page.

The Open Graph protocol enables any web page to become a rich object in a social graph.

A compression algorithm that takes your websites files and makes them smaller resulting in a faster loading page.

When browser caching is enabled on a website, it allows for that website to load for you faster by storing certain components of that site locally and refreshing on set intervals.

This can be in your head portion of the HTML file as a tag or file, and are standards used by websites to tell a website crawlers what NOT to scan or process.

When search results are filtered to show non-explicit web pages only.

A favicon, is a shortcut icon used as website icon, tab icon, URL icon, or bookmark icon, and is a file associated with a particular website.