If you are a novice, then I suggest that you can buy ETH, because the current price of ETH is very suitable for purchase, and ETH is the most stable
Yes ETH price is more stable and suitable for very long term process so if OP is looking for long term coin the ethereum is one of the choice but we have to invest on different coins to reduce the risk involving.But there is no best coin to invest so we need to pick our coin and invest the money which is affordable for saving ourselves from any loss if our crypto investment failed.