Bitcoin, Ethereum and BNB all are very good use case for long term and short term, so anyone can use them for midterm trading as well these are never been in bad shape even we have very bad crypto market.
Basically for a start, the top and solid coins should be the first zone of any newbies. The purpose of it is to have an actual experience about how's the environment of doing trades without the heavy risk that their investment will be crashed quickly. Crypto is volatile but at least by choosing those top coins, a newbie can test their skills without the sudden upward or downward trend on some altcoins.
While newbies progress and gaining knowledge, they can now slowly climb the ladder by choosing other coins. And eventually, once gained enough experience, these newbies will now be called experienced ones and they can even play with shitcoins whenever they like.