Seems like "several times per year" is the answer to your question, because no one really knows. Everything important is typically being announced here: https:/...

Please, clarify your question. What do you mean? Schema.org?

There are many methods to increase website speed. Enable browser caching Enable Gzip compression Remove extra plugin Minify javascript and CSS file Optimize your images

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8 Topmost SEO Tips Know Your Customers Choose Keywords Wisely Develop Original Content Optimize Your Titles And Meta Descriptions Image Optimization Utilize Social Media...

Write naturally for the user. How-to guides and topics that answer questions are very popular.

Forget keywords. Think search intent. What does the searcher need? What can the search query tell you about their intent?

There are so many websites offer free backlinks. It depends where you want backlinks Like: Social Bookmarking, Profile creation, Blog commenting, Quora, Forum submission...

Your question is way too general to answer. There are multiple free web services that will do the job, but each does it differently, based on different volume of data cra...