Advice on how to link different SEO assets?

I want some advice on my how to build a web of SEO. For hypothetical situation, let's say the domain is coffeedrinkers\[dot\]com The coffeedrinkers empire contains: * A main website (coffeedrinkers\[dot\]com) that sells products and has blog posts. * A youtube channel with ranking videos. * A community forum as a subdomain of my website. community\[dot\]coffeedrinkers\[dot\]com. This is fairly active and has a lot of user-generated-content. * An unrelated wordpress site called caffeinejunkie\[dot\]com What is the best way to interlink these in a complimentary way? Currently, I do this: * Publish blog on main site "*How to drink hot coffee super fast*". * Publish a youtube video "*Drinking how coffee super fast*" that has a description link to the blog site. * Start a community forum post about the topic "*How to drink hot coffee super fast*" that links to the main page.