How do you walk away from a trade on fundamental analysis ?

Hi guys, this is my first time posting here, so I apologize in advance if this question does not belong here.

I have been trading for a few years now, and I usually use technical analysis. This group has inspired me a lot to find value trades and invest for the long term.

I've been learning numbers around fundamental analysis, some have been working, but some are not (NFLX :) ).

Usually with technical analysis, I know where to have my stop loss and when to exit a trade when its moving sideways.

Whats your approach on value investing that lets you know to walk away from a trade, if to hold it, take profit, or loss. How do you guys usually set a target or a stop loss ?

Thanks in advance, and apologies if this question does not belong here.