As simple as adding a WordPress page/post and should be done when you come across a process that requires communication, or just something you feel would be helpful.
Keep in mind that this is done with the view to scale as we grow, so try and ensure that it’s fairly simple to understand.
At the very base of the page where you add knowledge, you will see this;
Click on Users with specific role, you will get this screen;
From there, just select which user role you want to be able to read the article. Should you need more information in regards to who gets to see what, head to the User Roles article.