A complex and varied school which essentially gives primacy to mind over matter, Yogacarais one of the two main schools of Mahayana Buddhism. A pithy summary of Yogacara philosophy appears in a quotation from the Avatamsaka Sutrafrom our Morning Bell Chant
If you wish to understand thoroughly
All Buddhas past, present, and future,
You should view the nature of the universe
As created by mind alone.
Working out what this means — from the truism that our ideas shape what we think the world is, to subtle analyses of how the mind works, to a deeply mystical sense that mind is the substance of the universe, to combinations and variations on these themes — gives rise to a vast philosophical literature.
Note that Yogacara and the other main Mahayana school, Madhyamika, are not mutually exclusive. The Zen tradition freely takes from both systems, depending on context.
For more information see https://www.newworldencyclopedia.org/entry/Yogacara