Know when to get out, which could translate as "work out the best size stoploss to ensure you're typically in on the right trades and out on the bad trades". This comes from refining your entry. For instance, if you've been shorting EURUSD randomly for the last two weeks with a 200 pip stop, you'll make money but eventually you may take a number of 200 pip hits. If you randomly entered with a 50 pip stop, you'll probably take more hits more regularly. So, your task would be to work out how small the stop could be (100? 150?) to enable you to take the moves or get out if your'e wrong. OR refine the entry so that you only needed a 1 pip stop (assumption: you're some kind of trading genius) or something smaller than 200.
Currently, I'm swing trading with just a 20 pip stop. Occasionally, the market proves I needed a bit more, but usually if it hits my stop, it keeps going so I'm glad to have been taken out.