First of all you must check the background of the team behind the project, that way you can definitely check if they are indeed legit, so they won't get away with your money or something else, after that, check the whitepaper extensively, that way you can get to know more about the project, if it is really something you want to participate in.
Definitely Yes I agree with what you have said mate. It is really better to look the website and whitepaper of the project if it is legit and the platform of the project if it is possible. Always research what everything about the project. The roadmap should be visible in the public.
. I don't wanna waste my time to see an useless video 
