Some rules for trading crypto currencies:
1. Never catch a train that took off.
2. Never trade on emotions.
3. Always use your stoploss and adjust it once you're in profit zone.
4. Do your own research. It's okay to use signals but double check them!
5. Buy the rumors and sell the news!
6. Don't buy at an all time high.
7. Don't do pump and dumps.
8. Never sell in loss (depends on stop loss of course)
9. You try to get more bitcoin in the long term.
10. Sometimes the market plays against you, skip the day.
This seems not a rule but a prediction and speculation, anyway, those 10 option is a good thing to deal with...specially if you are a newbie and don't have enough knowledge about this league. At some point, those option is the most common but effective way to avoid a potential devastating lost in the future. Also, please make sure you have plan B or C when in comes of crypto marketing ( for example, do some bounty hunting or play with some telegram signal group if you are familiar on it )