Fundamentals of capillarity -- Minimal energy and stability rubrics -- Droplets : shape, surface and volume -- Sessile droplets -- Droplets between two non-parallel planes : from tapered planes to wedges -- Microdrops in microchannels and microchambers -- Capillary effects : capillary rise, capillary pumping, and capillary valve -- Open microfluidics -- Droplets, particles and interfaces -- Digital microfluidics -- Capillary self-assembly for 3D microelectronics -- Epilogue