From the manual:

This is an Advanced Reiki Master course for those who are interested in
increasing their Reiki power and learning how to create new Reiki systems.
Even if you are not interested in creating new Reiki systems, you will improve
your skills as a Reiki Master by working with the symbols and techniques in this
manual.

The ability to channel energies directly is something we all innately possess,
but it's also a skill that can improve with practice and energetic clearing. The
more you can channel energies directly, the more powerful you can be as a
healer. You learn how to get out of the way and let spirit come through you to
do the healing. You become more in touch and aware of the messages coming
from spirit. You also become more sensitive to energy and can discern between
different “flavors” of energy.