Here I will post tips that I give to people I play with on EU West. Some of it may seem like really "duh" kind of stuff, but it is by no means as commonly known as it should be. We'll start off with this.
If you are at less than 10% HP, please go back to base and heal up. I don't care how close you are to killing someone, just go back.
Last game this happened, an ally tried to save his low-health ally and also died in the process. A two for zero exchange, just because you refuse to back off when you're almost dead.
A more experienced player that has been coaching me pretty much since the day I started told me to always return to base if my kill wasn't free while laning, and it has been one of the most useful tips I've utilized.
Another tip that's kind of just general knowledge (or should be) is that you should play like a complete pansy, which kind of coincides with your own post. Buy wards, buy health potions, don't push when you don't know what's waiting for you or whether or not you can handle what's waiting for you. There might be exceptions to things like this, but they are just that, exceptions, not the rule.
I just want Card Sagas Wars. Seriously, I'd do anything, just give me Card Sagas Wars. Please. PSN:ChocoboDreams