The Knowledge Base and Online Help are actually two separate resources. I would recommend using both of these in getting familiar with and configuring SmarterTrack.
The Knowledge Base is the area where we give step-by-step instructions. You'll find steps on using and configuring the functionality in SmarterTrack, as well as troubleshooting articles. The Online Help is available for understanding the concepts of SmarterTrack. You'll find information on what SmarterTrack is, how it works, details on what a feature will do, descriptions of the settings, etc.
As a starting rule, I'd say that if you know what you need to do, but aren't sure how it's done, check out the Knowledge Base. If you're configuring something in SmarterTrack and aren't sure what a specific setting is or what that feature does, use the Online Help. In fact, there's a Help button in the upper right corner that will take you directly to the Online Help doc for the SmarterTrack page you're on. Just click on Help --> Online Help. In that doc, you'll find a paragraph or two letting you know what the feature is and descriptions for what each of the settings are looking for.
Generally, you can find information on a feature in both the Knowledge Base and Online Help; the type of information you get will just differ depending where you're at. If you want to utilize both resources, I'd do your search in the Online Help. When you do, related Knowledge Base articles are shown as well so you can see Help articles and KBs side by side. In some cases, not all of the KBs will appear, but it'll give you a starting point.