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.
Going with your guts with a project that you are looking to invest in is not a very good idea in my opinion. Everyone can have different gut feelings based on circumstances or even what their heart or mind says about something, and that is now how markets should be judged as it can put you at great risk of losing your capital invested in that particular project.
So the best practice is not to follow your gut feeling but does extensive research about the project before you take your final decision of whether you want to invest in it or not, and your research must involve every possible aspect that can be an indication of a project's potential in the future.