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Many ancient Vajravarahi manuscripts, such as the Vajravarahi Mandala Puja (a puja manual) and the Vajravarahi Smasana Yoga Vidhi (a ritual text for charnel ground yoga), exist in digital form within university and library collections. These are available for free as part of academic archives. These are primary source materials.
In the most practical sense, a sadhana is a liturgical text—a ritual manual that provides a detailed roadmap for meditation. A Vajravarahi Sadhana PDF typically outlines the various stages of the practice in a structured format. vajravarahi sadhana pdf