Okay, let’s use getting out of your boat slip as a practice example to steering in reverse.
Trick number one: Turn your body so your front body is facing the stern.
With a tiller, stand facing the stern. Now think of your stern as “the new front of the boat”. If you have a wheel, then actually stand on the “wrong side” of the wheel. That may mean forward of the binnacle for you.
You want to drive / steer the “new front of the boat” in the direction you want. Forget about the bow! Except for checking to see if it is clear of the docks.
CENTER THE TILLER / WHEEL (rudder)!! We want to get water flowing over the rudder with the rudder at the boat’s centerline. If you don’t know if the rudder is center, go in reverse against your docklines to test it.
Note: With my outboard motor, I always test all reverse and forward gears while attached to the docklines just to make sure they work!
Detach all but one stern dock line. Which one you choose will depend on which direction you want to exit your slip and which one is most easily let go when the time comes.
Put the engine in reverse (still facing the stern) and allow the boat to act against that one dock line briefly and even use that line to edge your “new bow / stern” to the side you want to eventually go.
An excellent, simple yet thorough explanation! Somehow you were able to communicate the process without condescending overtones, also much appreciated since most of the”how to boating info” I find online is lots of old salty man-splaning