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I made a quick research and I founded 12 sites related to dental health care as link prospect who already accept a guest post with an average PA over 40 who accept guest post. so as I mention if the link has enough quality no matter the origin will help your site to rank and if this link has local signals or local keywords even better
According to Yoast cornerstone content are the most important articles on any website. This is the content that exactly reflects the business or the mission of a website.
Category pages or tag pages could make great cornerstone ‘articles’ as well. If you want to optimize your category pages for cornerstone content, it is of great importance to provide really awesome introductory content. You should make sure that this page is a compelling overview of the subject and invites visitors to read even more content on your site.
For example, on an Italian food blog, there might be an original recipe to make pasta. That recipe could be used in every blog post about pasta. So this original recipe would have the potential to be a cornerstone article. The bloggers should place it on the category page of ‘pasta original’. On top of that, they could add links there to all the blog posts that use the recipe.
Pasta Original > Cornerstone Content > Main Keyword or Topic
Place to buy ingredients > **Long Tail Keyword **
The history of the pasta > **Long Tail Keyword **
Alternatives for the pasta > **Long Tail Keyword **
Healthy ingredients > **Long Tail Keyword **
Cornerstone articles should be explainers, they should be informative articles. Even on a webshop, the cornerstone content should be informative articles. Perhaps you can write about the use of the products you sell or their history. Think about all the places you can link this cornerstone content, like in a blog post on new developments and in the actual product description in your shop!
Websites should have a minimum of one or two cornerstone articles and a maximum of eight to ten. If you want to write more than ten cornerstone articles, you should probably start a second website.
Linking structure for cornerstones
Cornerstone articles should appear very high in your site’s pyramid. Ideally, someone would be able to click from your homepage to your cornerstone articles instantly. You should link all your other posts about similar topics to that particular article. Subsequently, you will write tons of new blog posts focussing on new angles of the topic of your cornerstone article. From every single one of those blog posts, you’ll link to your original cornerstone article. Such an internal linking structure will increase the chance of your cornerstone content article ranking in Google.
Taking the Yoast website as an Example their cornerstone content is:
All the content in the website link to those articles/pages/content, you can check it by yourself. Let's take the URL (https://yoast.com/academy/courses/) go to your MOZ Open Site Explorer filter the result ok the backlinks (Just Internal Links) and you will see that practically all the site point to that page if compare it with any other random article you will notice the difference, in that way they tell to Google hey this is one of the most important Articles in my website and of course, is about SEO training then Google will compare it with other SEO training websites and decide which will be in first place
IN SUMMARY
Answering your question. Yes category pages can be a cornerstone content (you can consider core pages and cornerstone content as the same thing)
IF THIS ANSWER WERE USEFUL MARK IT AS A GOOD ANSWER 
When I run a wordpress blog through the structured data testing tool I see that there is @type hentry.
henry means text entry, it can be a recipe, an article, a blog post is most basic type of schemas. The hEntry schema consists of the following properties:
hentry
entry-title. required. text.
entry-content. optional (see field description). text. []
entry-summary. optional. text.
updated. required using datetime-design-pattern. []
published. optional using datetime-design-pattern.
author. required using hCard. [*]
bookmark (permalink). optional, using rel-bookmark.
tags. optional. keywords or phrases, using rel-tag.
If you ask how is structure a paragraph. A logical answer will tell you a paragraphs is formed it by words and letters is the same case here
Is this enough for blogs etc?
I already answer that question (No is not enough)
Is this a result of Wordpress adding in this markup?
Wordpress do not markup anything by default
Do you recommend adding @blogposting type and if so why?
I already answer that question
This the hierarchy of schemas
Thing > CreativeWork > Article > SocialMediaPosting > BlogPosting
What benefit to add a specific type of schema?
I already answer that question
How does it help in blogging?
I already answer that question
In Summary
Sorry I wasn't trying to bother you, in fact I was trying to help and apparently you didn't noticed.
Sources
Domain Authority is calculated by evaluating linking root domains, number of total links, MozRank, MozTrust, etc. — into a single DA score. This score can then be used when comparing websites or tracking the "ranking strength" of a website over time.
Page Authority is based on data from the Mozscape web index and includes link counts, MozRank, MozTrust, and dozens of other factors. Like Domain Authority, it uses a machine learning model to identify the algorithm that best correlates with rankings across the thousands of SERPs that we predict against, then produces Page Authority scores using that specific calculation.
Is it calculated exponentially? Just the developers of the algorithm can answer that question. But I'm pretty sure the algorithm is based on a Statistic Framework and Not on Arithmetic, Exponential Framework
Depends let's take an example
website.com/cartegory-1/ with a DA=40 is better than 2
website.com/cartegory-1/sub-category-2/sub-category-3/sub-category-4
website.com/cartegory-1/sub-category-2/sub-category-3/sub-category-4
IF THIS ANSWER WERE USEFUL MARK IT AS A GOOD ANSWER
It's a normal process when you start to optimize your website the more specific you are, the more precise information you get.
For example, when I started to optimize my website, I started using our brand keywords and the numbers were insane from 2% went to 80% of visibility, of course, it just was our main brand keywords.
Things changed when I try to use generic keywords then my visibility drop off and then I started to see real numbers
It is an arithmetic trick
Moz Search Visibility score represents your overall ranking performance for your tracked keywords. It’s calculated by:
Some useful links from the MOZ Seo Learning Center Related to your question
First of all Google Search Console can show you Crawled Pages and **Indexed Pages. **Google follows three basic steps to generate results from web pages:
Crawling: The first step is finding out what pages exist on the web. There isn't a central registry of all web pages, so Google must constantly search for new pages and add them to its list of known pages. This process of discovery is called crawling.
Indexing: After a page is discovered, Google tries to understand what the page is about. This process is called indexing. Google analyzes the content of the page, catalogs images and video files embedded on the page, and otherwise tries to understand the page.
Serving: When a user types a query, Google tries to find the most relevant answer from its index based on many factors. Google tries to determine the highest quality answers, and factor in other considerations that will provide the best user experience and most appropriate answer, by considering things such as the user's location, language, and device
In summary, no all your pages at least not all the pages in your Search Console will be available on SERPs
There is no difference between a free or premium domain, at least Google does not evaluate the domain itself, what Google evaluates is the profile of the domain, backlinks, internal links, content, relevance and so on. So usually free domain has no value from the Google perspective...why? who will invest money, time, links and content on a free domain, I mean if you have the money to pay for hosting, content, and links why you will use a free domain....does not make sense. How many Blogspot sites, free WordPress.com websites do you know that have real value and authority.
That's why I think, .cf / .tk / .gq / .ml / .ga probably will not have any value for linkbuilding.
The rel=nofollow links reign in the land of social media profiles, comments, and publishers
The value of NoFollow links has often led to heated debates among online marketers and SEOs. Ever since Google Penguin has been rolled out, the risk of links has become a central question.
People often claim that links marked as NoFollows have no impact. Some SEOs still rely on former Google statements suggesting that NoFollows do not pass PageRank, taking this as “evidence” that spammy NoFollow links cannot put you at risk of a Penalty.
The true is rel=nofollow links will not improve your ranking, will not pass you DA, so from the Google Index Perspective they are useless. But there are many ways to get the best of those no-follow links.
Getting SEO Value from rel="nofollow" Links
https://moz.com/blog/seo-value-nofollow-links
The Hidden Power of Nofollow Links
https://moz.com/blog/the-hidden-power-of-nofollow-links
A canonical tag (aka "rel canonical") is a way of telling search engines that a specific URL represents the master copy of a page. Using the canonical tag prevents problems caused by identical or "duplicate" content appearing on multiple URLs. Practically speaking, the canonical tag tells search engines which version of a URL you want to appear in search results.
So if you have a page such as
www.mywesbite.com you should have a canonical tag on that page like this one
on your header
So you should check your source code to check if the URL is ok or it's missing
These are some links you should read
Hope this information will answer your question
Hi, I Hope this answer help you
If you want a basic widget just for Google
http://www.googlereviewwidget.com/
https://richplugins.com/google-reviews-pro-wordpress-plugin
https://wordpress.org/plugins/google-places-reviews/
For a premium with option to use reviews of Facebook, Yelp, Facebook ect
https://wordimpress.com/plugins/business-reviews-bundle/
https://richplugins.com/google-reviews-pro-wordpress-plugin
https://reviewsonmywebsite.com/
Of course google knows the difference......so maybe are wondering how google knows.
Is very simple, google or the algorithm compares user intent vs keywords vs user behavior.
Example
I have website with a generic domain name such as dietpills.com, and by miracle Im in the first place so google start to compare
1000 users use the term "dietpills". So google put my site in firts place. But the Of 1000 just 20% of the user click on my site (Users read the description and the tittle and they ignore my website so or my website needs to optimize the descrition and tittle or my website is not relevant to the users) but is ok ...lets keep thinking ok 20% (200) of the users clicked on my website but 150 or 15% what ever you want ....leave the website before 30 seconds (Google units to measure the Bounce rate).
So whats happen? 95% of the users on the experiment was not interested on the website. for Google that means your website does not deserve be in the firts place.
Using the dietpills.com as example. The best option for me is create themes or topics base on the dietpills such as
so the term "dietpill" has a differents meaning for a 20 years old girl in Arkansas or 55 years old man from Los Angeles, so to get the firts place I has to be as useful for both, the girl and the older man but ....how I can do it
So simple.... create relevant content for boths.
If you want some advices you can email me to romandelcarmen@gmail.com