Hi everyone, my first newby post!

I use use a safety razor with the aim of stepping up to a straight razor soon.
Recently I aquired a badger hair brush which I enjoy and an apothecary mug.
I was wondering with this style of mug if you put the soap in the bottom and lather on top?
After investigating on YouTube about lathering techniques
it seems to be the appropriate way to lather with a bowl is without the shaving soap in it.
is this the same for a mug?
i would like to develop the correct technique from the get go.