Plastering techniques involve applying a mixture of plaster to walls and ceilings to create a smooth, even surface. Common methods include troweling, where a flat tool is used to spread the plaster, and spraying, which allows for quicker application over large areas. Another technique is skimming, where a thin layer of plaster is applied over existing surfaces to improve their appearance. Each method requires specific skills and tools, such as float and hawk, to achieve the desired finish. Proper preparation and drying time are essential for a durable and attractive result.