Altcoin will be down, if bitcoin goes up.
Altcoin will certainly go up, if bitcoin goes down.
Altcoin will stay or even going up if bitcoin is being stable.
You see whales take advantages of this.
When btc goes up, they trade to fiat.
when btc goes down, they trade to btc again and pump altcoin and take profit.
I've learned today because of this. You're right , we need some strategies for trading coins. If altcoins goes down then find some ways to earn in a different way .Let us say , think of a game plan that will also profit you..