The best strategy is to be patient. Cruptocurrencies are still in the early chilgood stage, progress for the future can be forsee. And when you are investing always do your own research about the project.
Yes we need to research about the project and it's amazing capability for good. We need to make wise decision regarding on our investment to avoid lossing. The most common strategy is investing while the price is low or maybe affordable and make hold and wait with a big patience until the price goes up and then sell.