You have to set your base up so there's a line of wells then your ancients a space in front of them and room for units. If you can draw the enemy into the Ancients then you're guna kill and make sure to stay organized. Don't bunch buildings up so much that when you tp you get stuck and you pretty much just have to use wisps to dispel anything with mana, and to repair, heal with wells, use hide (if night), target weak units, and have early units if you tech. A lot of noobs let their hero's health get really low and then TP out of the battle that they'd have won reguardless. Hero targeting is a good idea most of the time.