cold crashing is when you put the batch in cold temperatures. Yeast will sink as well as anything it attaches itself to. Usally a nice yeast cake can be seen at the bottom of the carboy. This also is useful when racking onto a keg, or in the bottling process. It aids in the clarity of a batch. If your bottling then your beers will not be 100 percent clear, due to the sugar content added. Mine never are, but they are clear when I bottle, depending on the recipe. Some recopies are meant to be cloudy, no matter if you keg or not. What kind of beer are you trying to brew?
It has no effect on carbonation.
Beauty lies in the hands of the beer holder
Bottled: Mambo in your mouth, Cranberry mead, Peach Ginger mead.
Primary: Firestone Walker Wooky Jack
Secondary: HopSlam, Citra DIPA