If we talk about the recent ICO it is found motly scam projects,So never be hurry to invst in ICOs or IDOs without any proper research.I think best way to invest in the new projects must search in leading Exchanges and when new project took place in lanunch pad then sortout worthy projects and invest accodingly.Also check the whitepaper,Team and the concept of the project.Community also matter must check social media handle of the project to find right analysis.
The new projects won't get easily listed in known/reputable exchanges, and it takes time until they are capable to do it. In fact, Shiba Inu never had, it takes months to get into Binance even the other coins.
That is a good suggestion to look them on the top exchanges as this could assure that those coins listed are good/promising projects. But if Op trying to risk looking for new projects, then he must check
https://coinmarketcap.com/new/To have our own research is very important and we actually know the background of this project as well.