Any standard method to detect which the real and which the scammer in every investment, ICO, or another transaction in crypto world?

If you have some experienced to detect spam, scammer, etc; please just drop some comment here. It's usefull for many beginner in crypto world.

As far as I know, one of threats in crypto world development is many spam and scammers. And we have to educated it for many beginner and investor about it.