Quote - I dont know how to translate this ... ' c'est en faisant des erreurs qu'on apprend "

Been awhile since high school French but it's roughly that "you learn the most from your mistakes."

Google translator would probably give better results than me.:biggrin:

On topic to the other posts:

Postwork is not always necessary but if you render with postwork in mind then you can fix, adjust, use creative options not available in rendering, etc. where needed.

Another reason to render for postwork is time. There are instance where an effect can be accomplished in image editing much faster than by rendering with comparable results. Two minutes in Photoshop or an hour rendering....

Rendering for postwork doesn't mean you have to postwork just gives the flexibility.

Global Illumination....if you aren't getting any shadows you're doing it wrong.