Mahamudra is the mail practice of the Kagyu Lineage and it involves to greatly simplify looking directly at mind.

“Sounds of Innate Freedom: The Indian Texts of Mahāmudrā are historic volumes containing many of the first English translations of classic mahāmudrā literature. The texts and songs in these volumes constitute the large compendium called The Indian Texts of the Mahāmudrā of Definitive Meaning, compiled by the Seventh Karmapa, Chötra Gyatso (1456–1539). The collection offers a brilliant window into the richness of the vast ocean of Indian mahāmudrā texts cherished in all Tibetan lineages, particularly in the Kagyü tradition, giving us a clear view of the sources of one of the world’s great contemplative traditions. In its modern Tibetan edition, there are six volumes containing seven kinds of texts: the Anāvilatantra (as a tantric source of mahāmudrā attributed to the Buddha himself) and its commentary, songs of realization, commentaries on songs of realization and other texts, independent tantric treatises, nontantric treatises, edifying stories, and doxographies (presenting hierarchies of different Buddhist and non-Buddhist philosophical systems). This volume contains the majority of songs of realization, consisting of dohās (couplets), vajragītis (vajra songs), and caryāgītis (conduct songs), all lucidly expressing the inexpressible.”