Long term - Bitcoin and Ethereum. Both are perfect assets.
Short term - altcoins like Ripple, Cardano and IOTA that are good for trading and buying something.
Bitcoin is not suitable for long-term investment. If you notice the price of bitcoin fluctuates every hour. There are days when bitcoin increases to $ 1000 or drops to $ 1000 very quickly. Invest in the day will suit those who want to invest in bitcoin