There are many common practices for each instrument.
  Sometimes people confuse the technical aspects with the emotional aspects.
  No matter how much musical sensitivity you have, you cannot play unless you have the ability (technique) to actually turn it into sound.
  Conversely, even if you have the technique, if you don't have musical sensitivity and nuance, the sound you produce will not convey anything.
  Practicing a musical instrument is meaningless unless you do these two things at the same time.
  When we think of practice, the first thing that comes to mind is technical things, but at the same time, you should also teach them to develop the emotional aspects, such as playing a gentle melody by themselves.
  Next are technical practices. The content and purpose of each practice should be explained well, and it is necessary to repeat them many times until they can do it.