For altcoins, buy low and sell high, and you will make a profit. Although this statement is correct, it does not go for all coins. Some people think that when the market rebounds, their altcoins will rise with it. But the result was leaving the market at a loss.
So choose wisely and follow up the project. See what their developers are doing, or just hiding behind the prevailing saying.
Not everything will happen according to what we plan. Buy low sell high is simple if you have enough patience to hold. Most of the newbies are really rush and they easily becone discourage when they saw a bloody market they started to become panic and loss thier fucos and sell everything in a panic way, that is why they loss, always remember that you will not going to loss if you don't sell you're asset at loss and holding is the best strategy to do. If you are following the crypto market from year 2018 till present you will find out how important holding is, based on the eth and btc price.