Here we provide you some places to put the wards:
wards in DotA is very important. Because it help us to have a vision on Mini-Map. It's also help carriers in our team avoid "gank" of the enemies. and it may help us kill the one who is near the wards.
Remember: "gank" is better than be "gank"
You can see the Top-rune and some vision at MID.