I use Lightroom (and Photoshop). The glib answer is Google. The two sites I used most heavily were www.luminous-landscape.com and www.earthboundlight.com but my list of bookmarks in the instructional category runs to over 20. Adobe has some very useful video tutorials, as well. I only found CiC much later.
I approach PP as I approach cooking. Read a lot of recipes, try a few out, see what works for me. That's works, as in what process can I remember two weeks later when I need to do it again.