=== How do I Know What the Cargo is? ===
You can check out what is in a cargo crate before you pick it up if you select it using "b" to get more information. A description of the object you've selected should be on the right side of your [[:HUD]]. If you press k (or whatever you have bound to bring up the character information screen) with a cargo crate targeted, you will get even more information.
=== How do I Drop Cargo? ===