You should always have most of your portfolio in BTC,ETH and other big cryptos, you just know they aren't scams and that you cant lose everything. The rest you can play around with and go into some altcoins, but you definitely need to do research, and you need to know what you think is going to work. Those are mostly projects that have usability, like GameFi projects or something like Sports betting with crypto (They have existing real world markets, so logically they will work with crypto too). For example I recently got into BORA and ENGN  in GameFi, and atm im looking around for some betting platforms so i can start to have fun xD. For now the ones that look good to me are Roobets and Lunabets. You just look around for projects and look at their white papers, ask around the forum about them (People here can be really helpful). You could also consider some staking in some DeFi projects, im staking half my portfolio.