There is an excellent tool, a plugin, that helps you do this seamlessly. It’s called Yoast SEO and it’s available in a free or paid version. When you start writing your posts, the “Yoast Internal Linking” sidebar opens up and suggests which posts you should be linking to. The primary suggestions are always to cornerstone content, while the other link suggestions are for similar posts or keywords.
Everyone wants to rank for those broad two or three word key phrases because they tend to have high search volumes. The problem with these broad key phrases is they are highly competitive. So competitive that you may not stand a chance of ranking for them unless you devote months of your time to it. Instead of spending your time going after something that may not even be attainable, go after the low-hanging fruit of long-tail key phrases.
Your keyword research will determine whether or not your search optimization effort will be a success or a failure. Many businesses make the mistake of basing their keywords on just the search volume. This often leads to attempting to rank for keywords that are very difficult and costly to move up, or even keywords that aren’t “buyer” keywords and just send useless traffic to the website.
Headlines are one of the most important parts of your content. Without a compelling headline, even the most comprehensive blog post will go unread. Master the art of headline writing. For example, the writers at BuzzFeed and Upworthy often write upward of twenty different headlines before finally settling on the one that will drive the most traffic, so think carefully about your headline before you hit “publish.”
The first step that I take is to do a quick Google search to find pages on my domain where I've mentioned the keyword in question so that I can add an internal link. To do this, I'll use the following search query, replacing DOMAIN with your domain name (e.g. matthewbarby.com) and KEYWORD with the keyword you're targeting (e.g. "social media strategy"):