As a newbie the first thing I would implore you to learn is the risks associated with investing in cryptocurrencies, once you are okay with it then you can take the next step of knowing how to research on projects thus knowing the one to go for and the ones to ignore. With that being said, the only way to know a worthy coin in this current market is through knowing what the utility is all about and how the team intends improving on it to make it attractive all the time, once you find this, the coin in question can be held for long term. That is to say, not all coins are worthy to be held long term. Lastly, the coins i would say are worthy for investing and are also good for long term are Bitcoin, Ethereum, Binance Coin, Cake.