Buy low and sell high so it is our chance now to buy as much as we want especially that the market is almost at the bottom meaning almost all the currencies are very affordable. We can just wait for the right time when we are going to sell it so we need to become very patience if we really want to profit in the future.

Greediness will kill us easily, so make sure that you should invest only the money that are extra or your savings. Don't invest the money that you would likely to be needed in the following days or for emergency cases as it will only cause you a problem especially if the market are still down and you really need that money. And the safest to invest are the top 5 currencies, you can just base on coinmarketcap for the rankings.