cost? scam? believe? Data cocoon room? This is probably why we are afraid to buy new token. So, starting tomorrow, I plan to take the first step to learn about an unknown token. Everyone is welcome to recommend, and the flag is here.

It was an individual choice OP. You can do anything, that is your money and decisions. People are giving warnings about the possible results of investing in new tokens/projects and it's up to you to listen or follow the recommendation. If you think it was wrong, then make a try at it just to know and feel why many people are suggesting not.
Because it has been known that new tokens/projects are usually involved in scam issues. People are aware of it which makes them think that it is good to choose established projects like ETH rather than hoping for new projects. Well, new projects offer huge ROI which attracts new investors as well but the question is how reliable they are or just broken promises.