First study the market, and then invest only you are confident with and you can afford to lose.
Your life should not depend on crypto investment as it is risky. But, there are no big gains without risk.
Choosing coins that have the potential to be profitable in the short term is certainly difficult, but I recommend investing in top ranked coins such as Ethereum, Cardano, Stellar, Litecoin and so on so that we are more calm because the coins have a large marketcap and are almost impossible to die.