1 Remember that induced drag is solely the by-product of lift, irrespective of speed.  Parasitic is speed-related—the faster you go, the more parasitic drag you will experience.

2 The expression “adverse yaw” is used to denote all yaw that is undesired, while the expression aileron drag refers to the differential yaw that is produced when the ailerons are deflected (as is done to produce roll).  Understand that aileron drag will produce adverse yaw, but there are many causes of adverse yaw other than aileron drag.  Note also that any form of yaw, adverse or desired, is controlled by the use of rudder.  Incidentally, yaw is desired during certain flight situations—e.g., slipping an aircraft on final approach to lose altitude, landing in a cross-wind, and spin training (yaw is often used to initiate the autorotation associated with spins).

3 This is another of those questions where careful reading is required.  Note the reference to “differential camber”, which is a made-up expression and not the same as “airfoil variation.”  Airfoil variation is a design feature to pacify the stall.

4 This is one concept that student pilots typically have difficulty understanding and remembering—right rudder is required during a climb.  The effect of asymmetric thrust (which produces left yaw) must be countered with right rudder (if you want to climb straight).