In this tutorial we will look at how to make use of a Poliigon displacement texture in Blender, making use of micro-displacement and the new displacement node in Blender 2.8.
Steps
Importing the material
Import the material in the usual way only with taking the extra step of opening up the advanced options and enabling the 'Use micro-displacements' option.
This will do a few things, firstly it will set Cycles to experimental mode, it will also add in an adaptive sub-division modifier in the modifier stack as well as setting the material displacement type to 'Displacement and Bump'. All of these are required for displacement to function properly.
Adjusting the Displacement
After importing the material you will need to manually increase the displacement amount to whatever looks correct on the target object using the displacement strength adjustment on the material nodegroup.
Additionally, you can raise or lower the entire displaced surface using the mid-level control.