If you want to leave Ijat a tip for writing this DotA guide you can do so here.
DotA Walkthrough Denying Creeps, Hero, or Buildings
DotA Denying Creeps, Hero, or Buildings
This technique is almost same as last hit, but the difference is you do it on your own creeps, hero or buildings without getting any gold.
To deny a creep, press "A" and select a creep to deny. Your damage must directly make him die on the spot to successfully deny a creep. Denying can also be done at your ally hero and buildings.
If you successfully deny a creep, there is "!" symbol with your colour shown at the top of the denied creep. Denying creeps, heroes or building can prevent enemy from getting extra gold from last hitting that.