A student should be the only one who doesn't understand this concept. A commercial pilot has been tested and is expected to understand it.
An instructor needs an even deeper understanding of it to be able to teach it.
Why did airspeed have a say in it? Because the vertical fin, canted off to one side, creates thrust to unload the tail rotor - remember how much left pedal you need in the hover, but when you are pulling the same power in forward flight, the pedals are much closer to neutral and might even be slightly right pedal forward.
As you slow down for the fixed thrust/stuck pedal landing, the fin becomes less effective, and so does the main rotor, requiring more collective to stay off the ground.
Here is one of many techniques, which I have found works for any machine I have flown, from an R22 to an S-76:
If you can line yourself up on a runway or landing area with the wind from the left, in a gentle descent around 30 kt, look for the speed where the nose is about 30 degrees left of straight ahead. Hold that speed until you are about 2' off the ground, then verrrrry slowly start to reduce the groundspeed.
As you slow down, it will want to sink, so you smoothly add lever to stay off the ground - the nose will come a bit to the right when you do so. Slow a bit, hold it off, see if the nose is straight yet. The important bit is :
DON'T LET THE NOSE COME UP!! You will slow down too fast, pull too much lever, and snap to the right.
Keep the gentle slow-down going until the nose is straight, then lower the nose and run on at that speed.
There are lots of other techniques. Ask your instructor, (if he/she has 5000 hrs or more) which one works the best for them. If your instructor only has 100 more hours than you, ask for a change. In cases like this, lots of experience in lots of situations is needed.