1.If possible never try to charge ur laptop while u r wrkng on it.It affects its battery life.
2.Stay away ur laptop from magnetic things,it can damage ur data.
3.If ur laptop gets in to water just switch off,dnt try to dry it with a dryer or any other thing.
4.Charge ur laptop as per the instruction,dnt over charge it.
I f#### my Nokia 7210 by overcharging it. 4th point xD
We never bother to read guide which comes along with box. We should read that carefully to increase our product's life maximum specially in gadgets.