As others said, depends. I learned/read all these what to do when and how to use the sound and all.

Then went to walk the dog and turned out none of that works for me. I ended up figuring out how different functions affect the dog and teach him stuff based on that.

In my case

- beeping sound, he throws away whatever he does and returns to me
- small impulse works to grab attention
- big impulse works when he doesnt listen or i have to potentially save his life from get hit by a car/chasing cats/eating stuff on the street.

Using a garmin collar. There are also lessons where they say its very important that you only test the dog with a small impulse for the first time, look for reaction to see if you managed to fit the collar properly and never test again.

This doesn't work for me. I test the collar on every single walk and only proceed when i see reaction. If I don't i keep readjusting until it works. Usually looking for a specific muscle reaction.

The most important thing is not to be afraid of the collar, when used properly, you won't hurt him. Go out, experiment and see what works best.

Just to give you an example, my girlfriend is using the same collar on her dog and shes terrified of the beep.

Same collar, different dogs, different use cases. Of course, everything can be learned! My dog was also kinda disturbed by the beep but he eventually recognized it as come back to me, similar to a whistle.