One of the most basic rules about investing is to not rely on the person that is trying to sell you something as your main source of information, it is fine to read the white paper and the roadmap and all of that stuff but that is not enough, you need to do your own research you need to read what other people in the forum think about project especially if they are well respected and you need to check if they are who they say they are, only once you do all of that you can invest in a project.