2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227682We define invariants of null--homologous Legendrian and transverse knots in contact 3--manifolds. The invariants are determined by elements of the knot Floer homology of the underlying smooth knot. We compute these invariants, and show that they do not vanish for certain non--loose knots in overtwisted 3--spheres. Moreover, we apply the invariants to find transversely non--simple knot types in many overtwisted contact 3--manifolds.70 pages, 30 figuresSymplectic GeometryGeometric Topology57M27; 57R58text