A piece of camphor dances on the surface of water without any obvious provocation. A water spider can skate on a pond without wetting its legs. A container with a small hole at the bottom can manage to hold mercury. Great effort is required to separate two flat glass plates if there is a thin layer of water between them. When a narrow glass tube open at both ends is dipped into water, water rises in the tube. All these events can be explained by the fluid property called surface tension. Surface tension is a molecular phenomenon which occurs at the surface of separation between two phases such as a liquid and a solid, a liquid and a gas, or a solid and a gas. We shall teach you the basics of surface tension first, and then follow up with a large number of problems at both simple and challenging levels. Our video lectures on this topic are titled Theory of Surface Tension, Angle of Contact and Shape of Meniscus, Excess Pressure within Liquid Drop and Soap Bubble, Force between Two Plates Separated by a Liquid Film, Rise or Fall of a Liquid in a Capillary Tube, and much more.