The paper presents a vibrational model for the transport properties of dense fluids, focusing on the self-diffusion, shear viscosity, and thermal conductivity. The model assumes that atoms in liquids oscillate around temporary equilibrium positions, similar to solid-like vibrations, but with longer time scales. This diffusive motion allows liquids to flow, distinguishing them from solids. The model has been quantitatively successful in describing these transport properties, relating them to the collective excitations in dense fluids. The paper discusses the normalization and excess entropy scaling of transport coefficients, providing a qualitative overview of their behavior across different density regimes. It also delves into the physical picture of liquid dynamics, where atoms exhibit solid-like oscillations and diffuse over time scales much longer than the oscillation periods. The Stokes-Einstein relation between self-diffusion and viscosity is derived, and the thermal conductivity is modeled using a layered structure approximation. The model is applied to various single-component fluids, including plasma-related systems, Lennard-Jones fluids, and hard-sphere fluids, showing good agreement with numerical and experimental data. The applicability conditions of the vibrational model and the gas-liquid crossover are also discussed.The paper presents a vibrational model for the transport properties of dense fluids, focusing on the self-diffusion, shear viscosity, and thermal conductivity. The model assumes that atoms in liquids oscillate around temporary equilibrium positions, similar to solid-like vibrations, but with longer time scales. This diffusive motion allows liquids to flow, distinguishing them from solids. The model has been quantitatively successful in describing these transport properties, relating them to the collective excitations in dense fluids. The paper discusses the normalization and excess entropy scaling of transport coefficients, providing a qualitative overview of their behavior across different density regimes. It also delves into the physical picture of liquid dynamics, where atoms exhibit solid-like oscillations and diffuse over time scales much longer than the oscillation periods. The Stokes-Einstein relation between self-diffusion and viscosity is derived, and the thermal conductivity is modeled using a layered structure approximation. The model is applied to various single-component fluids, including plasma-related systems, Lennard-Jones fluids, and hard-sphere fluids, showing good agreement with numerical and experimental data. The applicability conditions of the vibrational model and the gas-liquid crossover are also discussed.