If you are preferring to trade with the help of limit orders and then you must choose non-news hours as market may not show much volatility in such hours. Still, wild fluctuations may happen at any time hence placing stop-loss order at the time of placing entry order is also most mandatory one to secure your capital.
Non-news hours are not their cup of tea for the traders who prefer scalping or short term swing trading. Limit orders along with stoploss will definitely a powerful weapon on news hours if your technical analysis are good enough to predict the directions. These all are about the level of risks, you are affordable to manage.
as the coin continue to increase in prices, so should your stop loss and in this way you turn your stop loss into a take profit order and this prevent you from losing on a trade.
We do call it "trailing stoploss". This way pro traders never have target levels but they accept their profits at the stoploss levels.
Yeah, if you keep increase your stoploss order along with market prices then after some point, your stoploss order will become higher than your entry. When the sentiment of market changes, it will come down and trigger the stoploss order and then those pro-traders will go for shorting from that stoploss levels.