There are many stages of ritual / meditative practice at the different stages of Dzogchen.
For example, at the start, one should reflect on previous human births, the fact of death and impermanence, the unsatisfactory nature of samsara, the cause and effect system of karma, the benefits of liberation, and establishing a good relation with one’s teacher.
These aspects essentially correspond to the (preliminary) Theravada level of spiritual attainment, from the Dzogchen / Tantra perspective