I second that. Right now, the market isn't showing any clear signs of trends that await us. So Bitcoin, being the top currency, is the safest bet, as during bad times it loses less than other coins, and during good times it can bring some profit. Just look at the top altcoins on the current market, and you'll see that they basically follow BTC movements now, but when Bitcoin is down by 8.8%, Ethereum is down by 9.6%, and Cardano by 12.1%. Of course, some are temporarily doing better or worse and any high-cap coin is alright, but why bother with them when there's Bitcoin?