Making My WeB APP Responsive

Hi all,

Im Really NEW to Yii Framework. and started to do developing in Existing Web app in Our company.

Now they want to make web app Responsive.but i dont have anyidea where to start. after googling i found there is a extension in Yii called yii-bootstarp. and i can see there is a Bootstrap folder in extension folder.

I want make my main.php resposive first. dont know how to do.

Can someone explain abt this from where i shoud start?