Hi himalaysoni,
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).
I haven’t done most of them but you can check these tutorials as well: SketchUp and V-Ray :: SketchUp 3D Rendering Tutorials by SketchUpArtists
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)