Introduction
Adding new content types to UB can be done in two different ways. The first is based on utilizing one of the existing six core databases, while the other builds a whole new database and later connects it to the rest.
For now, you can refer to this infographic on whether to choose the first or the second method:

How to Create Special Note Pages (In Existing Databases) in Ultimate Brain
This method is recommended for when you want to simply create a custom view, but doing so most likely wouldn’t require creating many new properties. Here, we’ll utilize the single All Notes database to create special views for specific stuff.
In this video example, Thomas shows how to create a Software Tracker:
Travel Tracker Example
In this short video, Alex shows how to create a Travel Tracker within the All Notes database:
How to Integrate New Databases into Ultimate Brain
In this video, Thomas describes the process of integrating new, separate databases into the existing Ultimate Brain system. This is recommended when you want to create a resource that will require multiple new properties, and simply having it as a Linked Database of the existing All Notes database would alter the main database too much.
Dictionary example
In this Loom recording, Alex talks about creating a custom Dictionary database and connecting it to the existing Ultimate Brain system: