Hello …!!
i have been learning SketchUp from last 2 years from google and youtube but i am very poor in rendering . I want learn rendering specially Vray so any one suggest which cvhannel on youtube is good to learn it easily and fast.
actually i have been gone through a lot of tutorial but they dont provide that much understable knowledge to understand rendering.
I highly recommend you to go through this kind of official tutorials & manuals: Documentation - Chaos Help
It gives you the fundamental aspects. You can start with checking those exterior & Interior scene tutorials there. Also if you need more detailed information about something else you can use search box that is on top-left (try searching “Light Cache” for example).
If you want to go deeper for post processing your renders, i suggest learning “Linear Workflow” : FREE Vray Tutorial - Gamma 2.2 setup or linear workflow - page 1 (This tutorial is done via 3ds Max + Vray but you can get the idea and apply for other applications)
The official tutorials are a good start but a lot of times the end result is a very flat and stark image. You need to supplement your rendering engine with photoshop for post production edits.