Sort out/separate the wheat from the chaff
Definition 1 of 1
Pro Tip 1/3Metaphorical Origin
Understand this idiom's origin from separating grain (wheat) from inedible parts (chaff) during harvesting. 
Ancient farming practices involved winnowing to sort out the wheat from the chaff.
Pro Tip 2/3Evaluation Context
Use this phrase when describing a process of evaluating quality, performance, or suitability of individuals or things. 
The audition was a chance to sort out the wheat from the chaff among actors.
Pro Tip 3/3Non-Literal Use
Remember, it's about figuratively separating the good from the bad, not literally dividing grains. 
Before we launch, let's sort out the wheat from the chaff in these marketing strategies.