A building block is a component needed for building an Event. The building blocks are located in the menu in the left sidebar in the rule editor, separated into the groups; Segment Conditions, Triggers, Conditions and Event data.
To make an Event, drag and drop the building blocks into the area with the corresponding color.
If there is a behavior you cannot track with our current building blocks, you have the option to create new building blocks. This is an advanced feature for developers. Contact your company administrator if you want to add such a feature.