Usui Tibetan Reiki
Reiki is a practice of healing and personal growth that uses the energy that surrounds us to balance oneself and other people through a system of laying on of hands.
It acts on our energy system, helping us to recover our balance and works at all levels (physical, mental, emotional, spiritual) regardless of our age, our state of health or our religious belief.
The Reiki course is made up of 3 levels. To practice Reiki on yourself or other people, it is not necessary to complete all 3 levels since the first will teach you what is necessary to practice it.
It is characteristic for its simplicity.

Kundalini Reiki

The systems called "Usui" or derivatives, such as Karuna, Tera-Mai, Tibetan... are characterized by the use of symbols, mantras, specific positions of the hands, etc. In addition to sharing a common origin in the teachings of Master Mikao Usui and the application of his principles.
Kundalini Reiki 1 is equivalent, energetically speaking, to Usui Reiki 1, 2 and 3. That is the first reason why it is recommended to have performed Usui 3 before embarking on Kundalini Reiki. Your system is already more used to working with energy, it is also more free of blockages and that makes the Kundalini Reiki healing crisis less severe.
If you are a therapist, this level complements you and allows you to channel both energies to your patient; in addition to allowing you to evolve more quickly.