If you have the big capital to trade, scalping is the easiest and faster way to generate profits in trading as most cryptocurrencies fluctuate in minutes.
But, if you don't, just waiting for long-term like weeks or months for the coins to gain more value and then sell it, in most case; people waiting for months for new coins to reach a higher price. But in general, if you can't wait for months, some coins prices such as eth, ltc, dash, xmr, xrp can increases within days or weeks which make you can extract the profits.