Google algorithm is mainly reads for duplicate content in the site, if it founds the low quality or duplicate contents in blog page or website then it would be penalized by google algorithm
No follow is a value that can be assigned to the rel attribute of an HTML a element to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index.
I think nothing would be latest in SEO technique, rather that the way of working style and new updates of algorithm makes changes in SEO technique,how ever the strategies of SEO are same at anytime.
Because, duplicate or low quality content is rejected or penalized by Google Algorithm, also a good and attractive content leads to gain more clients and customers over internet.
"Keyword stuffing" refers to the practice of loading a webpage with keywords or numbers in an attempt to manipulate a site's ranking in Google search results.