This lecture covers the fundamentals of fluidics, focusing on topics such as Reynolds number, laminar flow, vortices, swimming at low Reynolds number, sedimentation of particles, pressure drop, flow profiles, and lift forces. It also discusses the behavior of particles in laminar flows, including the use of obstacles for sorting, focusing due to lift forces, and the Dean effect in curved channels. Additionally, it explores gas flows and the Knudsen number, highlighting the continuum flow regime and the transition to free-molecule flow. The content is supported by examples and numerical calculations.