what is support and resistance and how to use it ?

The support and resistance (S&R) are specific price points on a chart expected to attract the maximum amount of either buying or selling. The support price is a price at which one can expect more buyers than sellers. Likewise, the resistance price is a price at which one can expect more sellers than buyers.

Using Support and Resistance After a Breakout
Old Resistance Becomes New Support – If the price breaks above resistance, that resistance level may now act as support.
Old Support Becomes New Resistance – If the price breaks below support, that support level may now act as resistance

Support is a price point which is below the current market price and indicates buying interest. Resistance is the price point which is above the current market price and indicates selling interest. Support and resistance are used to identify the targets for the trade

Support and resistance levels are important points in time where the forces of supply and demand meet. These support and resistance levels are seen by technical analysts as crucial when determining market psychology and supply and demand.