what is important of executing yii migrate in installing advance template

Yii 2.0 General Discussions
1

Hi, I just want to ask what is the important of executing command in the console yii migrate if we install advance template ?please enligthen my mind I am confuse

Thank you in advance.

2

running the migration automatically connects to your database and creates the correct data structure for you in your database. The application will not work correctly without that.

3

before I will execute yii migrate,do I need to configure first my database in common folder to specify my db ? and then I can now execute the command yii migrate ?

Thank you in advance.