The Set node up top is “Set Head Rotation”. The white line coming out of the left of it is an “execution” line that is from a Tick Event. The Blueish dot is called a “Pin” and is linked to the “Combine Rotators” node that is adding the sedans rotation to the oculus rotation to offset it by the car’s turning. The execution running out from the right is just continuing the
If you are new to blueprint scripting, I would recommend checking out these resources: