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So both short-term and long-term traders and investors, must do enough research before they make any investment in any cryptocurrency whether old or new because that makes them understand whether it deserves investing in or not.
But Bitcoin and Ethereum certainly don't need research anymore, just need to see where is the right time to enter and invest for the long term.
In addition to these two coins, of course, detailed research is needed to find out how well they develop in the future.
Some of the top coins are also quite good like BNB, SOLANA, etc. which can be an option for long-term or short-term investments.
But for the short term, it is better to choose coins with high volume, which signals a fairly fast movement and that is good for short-term trading or scalping.