When writing a post on a matter that you are an expert on. Then the only external resource you would need is tools to help you generate a list of long tail keywords and ordinary keywords. Finding the right set of keywords is critical to obtain favorable SEO visibility.
Toast is one of the main authorities on SEO with his software, e-books, courses other products.
Infographics about choosing keyword
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Keyword research tools recommend by Yoast.com
https://www.google.com/trends/
https://adwords.google.com/KeywordPlanner
http://tools.seobook.com/keyword-tools/seobook/ – Powered by WordTracker
Other keyword research tools
http://www.wordstream.com/keywords
https://moz.com/products/pro/keyword-explorer
http://www.keyworddiscovery.com/search.html
https://serps.com/tools/keyword-research/
Blog post analysis tools
Disavow backlinks
https://support.google.com/webmasters/answer/2648487?hl=en
https://moz.com/researchtools/ose/
Other tools
https://ahrefs.com/content-explorer
https://twitter.com/search-advanced
Paid tools
Software
http://www.marketsamurai.com/full-version/wdcu5b/