If you're a trader, then it makes sense to trade these crazy Bitcoin/altcoin swings but if you don't know what you're doing you'll likely loose out in the end. If you're a holder... then look at your original thesis behind your purchase. You should only sell if your thesis changes.
Of course we will loss our money if we do something without doing the knowledge about trading.
Better to keep an eye about knowledge and also use experience to make our trading more better. Gain profit is our goal so make sure every strategy is in well preparation.