https://poloniex.com/support/stopLimitOrders/Stop-Limit Orders. A stop-limit order is an order to place a regular buy or sell order (also known as a "limit order") when the highest bid or lowest ask reaches a specified price, known as the "stop." This can be helpful for protecting profits or minimizing losses.
You can go on the above link to learn more about stop loss and how to use it.
Stop loss is only helpful to limit your losses simple sell order is enough to take out profit when your target price will be reached.
