Adobo:
Horizontal trim (hover), precision bouyancy control, helicopter and back kick, use of a long hose.
Edited to present a more even tone:
I seem to recall some people commenting something to the effect that with proper instruction, most divers get bouyancy nailed down while in OW training. I am curious to see if TS and M found value in going over bouyancy and trim after having 50 dives under her belt.
as someone who is "new to diving" you seem to have done a lot of research on some things such as "what most divers learn in OW". I know for a fact that I did not nail my bouyancy or trim during OW...unless you call "walking on the bottom or silting up an environment" good bouyancy and trim. Now lets go back to your first sentence and work our way down systematically:
Horizontal Trim(hover): see above, not only are these things able to get you more viewing space since you are looking down and forward instead of just straight down(or just forward), but this position also gets more air to the lungs since your airway is more open. (or at least i believe).
Precision bouyancy control: while a pure OW diver might not need this(and by OW i mean diving in the ocean with nice clean sand that is relatively hard to silt up), anyone diving in lakes, quarries, etc needs this since if they touch the bottom their visibility goes to crap and now they could be in a world of trouble without proper lighting etc.
Long Hose: having done 0-15 dives I am guessing you are at least certified so you have done some sort of OW air share with a buddy...tell me was it "comfortable" to do while holding on to his harness/bc straps in the position taught by NAUI/PADI to do an air share? I am going to guess not, because I can tell you that I hated it. A 7ft hose on the other hand gives you some leeway. You don't have to hold on to your buddy, nor be so close to each other. This gives your buddy MUCH better chance at calming down and being able to be a good buddy while you surface.
Back Kick: Lets say you are in the keys/bahamas/reef area. You are coming close to a reef, but know that touching a reef = reef death. You could kill hundred and thousands of years of reef growth with a single touch. You want to stop yourself from touching it so you perform a back kick to back off from the reef.
Helicopter Kick: Lets say you want to turn away from "above said reef", you don't want to kick the reef with your fins do you?
Any more questions? feel free to pm me, I have also sent this as a pm to your mailbox.