Manually: Watching the price and manually clicking when the level is reached. Good if you are an intraday trader, and dont leave open positions overnight. It is not good when price moves violently, especially in crypto, often you will not have time to react.
I find this interesting and it looks like an advise never to leave running market over to the next trading day, this is dangerous. Every trading day has it own challenges so never expect total continuation of the previous day. So close your running trade if on profit or you put stop loss if you are losing before the night falls.
Every day is new, prepare a fresh set up and see direction of the market because if you leave a running to the next day, you will be emotionally confused to take accurate trading decision.
I do plan my trade before pulling the trigger, I have zones for virtual Stop Loss usually at the last swing of the price while sitting down to monitor my trades, if the price reverses and move against my intended direction and once it reached my predetermined zone for placing a Stop Loss I manually close the trade and take profits as well manually if profitable, I have enough time to monitor my trades, I don't use Stop or Buy limit and Sell or Buy Stop, I always consider the high volatility of the price and wouldn't take things for granted like if the broker or exchange couldn't trigger off an automatically placed Stop Loss which will consequently lead to liquidation or wipe off my account.