MOZ Blog is awesome, its one of my favourite blogs to visit on articles related to digital marketing topics. Visit the blog and check it out yourself.
Google Webmaster Central Blog
Google Webmaster Central Blog is written by the engineers and the staff from Google on topics related to digital marketing. Visit the blog and check it out yourself.
Search Engine Land
Search Engine Land is one of the few go to places that is always up to date with the latest news and stories on digital marketing. Visit the blog and check it out yourself.
Google Search Quality Rating Guidelines March 2016
Google has released their latest version of the Search Quality Guidelines. Its a must read for anyone working in digital marketing. Download it and check it out yourself.
Webmaster Central Help Forum
Webmaster Central Help Forum is setup by Google and its a great resource to check out frequently asked questions related to search related topics. Visit the website and check it out yourself.
Growth Hackers Community
I came across Growth Hackers community from a tweet by Sean Ellis and I have been using this resource ever since. Another great community where the users share articles related to growth marketing, product marketing and other aspects of marketing. Visit the website and check it out yourself.