All the basics of vSphere are covered well in this lab:
HOL-1810-01-SDC - Virtualization 101: Introduction to vSphere
While this doesn't get into the nitty-gritty nor does it include the various other products that have a few questions on the VCP-DCV (e.g. vSphere Replication, Horizon View, vSAN etc.) it is definitely a good starting point to get practice with the fundamental elements of the core products.
The best advice I can give regarding this (or any VMware) exam is to spend time going through the blueprint of what can come up on the exam - this will allow you to identify knowledge gaps and which elements you need to focus on learning.
Hope this helps.