How to choose keywords in Google Adwords !
 

Actually I'm to much confuse by Google Adwords & I don't understand how to choose right keywords for my webs site by help of Google Adwords ! When I research any keywords in Google Adwords so I see three colum first one is Competition, second one is Global Monthly Searches colum, & third one is Local Monthly Searches! Now I am confuse in these three colums ! you tell me how do I define to choose right keywords !