Check out example codes for "ionic grid". It will help you in understanding the concepts better.

Code Example 1

<ion-row>
    <ion-col size="12" size-md>
      ion-col [size="12"] [size-md]
    </ion-col>
    <ion-col size="12" size-md>
      ion-col [size="12"] [size-md]
    </ion-col>
    <ion-col size="12" size-md>
      ion-col [size="12"] [size-md]
    </ion-col>
    <ion-col size="12" size-md>
      ion-col [size="12"] [size-md]
    </ion-col>
  </ion-row>

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