Hey guys,
I've checked some intersting altcoins which are pretty cheap now, the projects look promising and legit but I'm still afraid that they could be another pump and dumps (there were so many of them already!). What are the signs or metrics that send alert signals about the projects and I should check deeper or not risk my money? Or is it just impossible to tell if it's another pump and dump scam project.
You cannot actually tell. The price is motivated by the demand and the supply of the coin. These are based on how the people view a project. Any coin can pump when there are a lot of people buying the idea of the project or the product or fomo-ing on the price increase.