Getting Started with LightZoom and post-processing

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Getting Started with LightZoom and post-processing

I'm new to post-processing, and am really impressed with LightZone.  My laptop runs Ubuntu, so Lightroom isn't an option.

It's beyond the scope of the LightZone documentation to explain the fundamentals of digital photo post-processing, but can someone point me to an appropriate resource?  I've been watching the tutorials, so am now familiar with the mechanics of the program.  So I know HOW to invoke a tool and tweak the settings, but not when or why I should use it.  

Of course, a tutorial that used LightZone would be best, I've followed along with Thierry Martin's videos from 2013 to get started, but am open to more suggestions.