I will discuss the problem of quantum thermalisation in a closed quantum system from the point of view of entanglement dynamics. To this end, I will introduce a tool—the information lattice —to divide quantum information into scales and using that visualise the time evolution of quantum information. With the insights gained from this I will explain in some detail how closed quantum system thermalise. This will be consistent with the Eigenstate thermalisation hypothesis that I will explain. In an attempt to make this talk relatively self-contained, I will start with a longer introduction to entanglement in quantum matter.