1. General Dharma Teacher
2. Teacher who Inspires you along the path & gives you vows
3. Teacher who bestows empowerment and transmission
4. Teacher who guides you along the path
5. Teacher who explains and clarifies the Dharma
6. Teacher you gives you liberating pith instructions

+ Your Root Teacher, who could be any or all of the above types of Teachers

Watch: General Vajrayana Samaya Vows and the Six Types of Buddhist Teachers
by Ven. Khenpo Tsewang Dongyal Rinpoche