Eduardo, this is such an ignorant video, it makes me cringe!

...it's for children or total beginners, who are not offered a proper understanding about what they're "supposed" to do.
FIrst of, I've been using tablets for literally 30 years..eh..29 to be exact, and I know by heart that you have to find your own preference. I've had it in front of me in the first year, because it was on a "Paintbox", as this special computer setup was called. Nice, but not really pleasant to me. Right after that I could afford to buy my first tablet and had it next to my keyboard ever since, though it is nearly parallel to the monitor, you simply have to calibrate yourself. This way, however, I have left and right hand fully functional, allowing me to use the keyboard fluently and freely, while having my painting hand freely moving next to me. I would always suggest that people find out what feels best for them and give each concept a fair chance to establish proper feedback.
Then, the reason for why one may switch hues, is because of substance and lighting circumstances. Unless you're in a black box with a white light on a totally non-translucent material, you will always have a variety of bounce light sources that will alter the hue of your object.
In Verve and in real life painting, I suggest to be very aware of the environment in which your subject/object is placed as well as what material it is made of and, of course, the light source itself. Hardly any light is ever pure white, if there is such a thing "on earth".
What I do, if I seriously paint, I actually consider a base tone for my object- or the basic colors of it- and then I consider the most relevant color from the environment (blue sky, for example, or main room color and so on). I then would turn down the brightness of my base tone, paint a section and then pick the color of my environment and dip it into it, smudge a bit and then pick that color to go on. Or what ever feels like the best technique of application for the particular situation.
When an object folds in on itself, such as between fingers, for example, or any folds for that matter, you have to understand that the bounce light will saturate the specific color, like turn it more towards the base tone and stronger as it goes dark, simply because brighter parts of it still bounce now colored light onto the darker side and so on...
The other reason could be translucency as well, when light that hits the surface of an object gets dispersed under the surface (skin for example, or fruit, etc...), which then is already filtered by the color of the skin and other tissue, effectively saturating or intensifying the color as it goes into shadow and more of that subsurface light is seen than any light on the surface itself.
Thus, it's not that you'd randomly change hue to create an effect, that would be silly. You should know what and why as you are doing it. It gives you greater control and it will allow you to purposely abandon it, if you wish to.
Most of all, this kind of understanding liberates you from these nonsense demands on control, as you yourself have no control in your mind about what you're doing. The moment you begin to mimic some bogus you've been told, because you can't truly rationalize why, you'll be lost, if you're not given the exact same kind of tools as your puppeteer was employing.
Relax, think, feel, explore!
To be honest, I've stopped after that and didn't even get to 3 in this unpleasantly ignorant clip. If there's a hidden gem in there, I apologize, but those first two points are so radically wrong and arrogant, it was impossible for me to continue.