Some investors are ready to invest on any project they come across just because they really want to make profit and some of this projects are considered to be a scam project which people invest reasonable amount of money. It is very painful when money is invested in this project and they end up becoming a failed one. I think good reasoning before investing will really help investors from losing much money about projects they do not know about much. Investors needs to ask themselves before investing "what if I lose my money investing it in this project? I think this question can help people to invest with the amount they can afford to lose or not to invest at all on project very not sure about.
Investing without any reasoning can just make one to invest without considering the risk and the probability of making lose or making gain from the investment.
One thing many people don't consider while buying a coin is how popular it is. That is to say how much it has been traded over last 24 hours, last week, month and year. Just a 24 hour data could be misleading so you also need to check for longer time frame. Coinmarketcap shows the 24 hour volume and also displays it's position by how much active the trade of that specific coin is. Take an example of the current hot coin, Near Protocol, it's number 17 by marketcap while at the moment it's no 15 by trading volume. USDT generally is the number 1 due to obvious reason and for non pegged coins, Bitcoin, Ethereum and Solana are the top 3 in order.