My opinion is that there are no universal rules for determining the best cryptocurrency and timing to invest in it. It's important to monitor the market and its dynamics, as well as stay informed about news in this sphere. In this business, one should never rush and it's better to double-check everything.
Yep, that's the basic understanding one should have, no one is going to serve them the best cryptocurrencies in a plate for them, even if you see a certain cryptocurrency in the top list, you should still do your due diligence before you invest in it so that you can be sure that the project has got the potential which is why it is on the top and it isn't because of a trend or some hype that made it gain that rank in the list.
So as a trader, one should be able to do research and analyse projects and all the metrics in them to determine whether a project is good enough for an investment or not, if they think they can't do this, they should only invest in cryptocurrencies that they already know are good and trusted such as Bitcoin, Ethereum, Ripple, Litecoin, etc.