The ‘canvas’ which everything else resides upon is currently thought to be Quantum Fields: Quantum Fields: The Real Building Blocks of the Universe - with David Tong. (A 1h video by a theoretical particle physicist that’s in layman’s term, very educational and downright LOL funny at times. Well worth your time!)
A Field is something that permeates the entire universe. There’s thought to be a field for every particle in the Standard Model. Electron, photon, charm, up, etc. A particle forms when the field is excited, and these particles interact with each other to form the universe.