1. DYOR - always following my gut.
Yeah, like it's a good thing to make DYOR at all times but saying that you also follow your gut is a good strategy.
But our guts can also be wrong. I know that feeling that sometimes we tend to feel something good or bad within a project but that won't be enough IMHO to have a verdict whether you should invest or not.
Most new coins are just being done based on their promotional tools and drives but then, the majority of them are ending badly.