There's really a lot to consider whether a coin is worth investing but mostly some people buy it if its listed to big exchange like Binance which leads to pumping, some people think it's nice to buy those kinds of coins since they are new and fresh and it is listed on big exchange.
But me, I still choose the old coins with has a big market cap already rather than investing to lowcap coins which some people managed to control or manipulate.
On a volatile market, its safe to invest on good coins because you already have a price history as you basis and if you’re going to invest on new project, then you’re totally clue less. Maybe, new projects with a good platform that was able to hit an exchange tells a great news, you just have to understand the project and see how it works maybe you’ll invest later on. I’d personally have my own personal standard on investing, exchange listing is one thing for me especially if its on the top exchange.