MoM / YoY metrics

[maziiw]

I am a complete newbie to Looker, just starting doing training on it. And I have a measure: Net Sales - it is preexisting.

And i want to create a MoM and YoY metric and I am really lost with all the help I see on forum.

Could someone help me write this, and also, could someone explain why, when I click on explore a measure (net sales) and Run, I get 0? It is possible there is actually 0 there, but can there be other reasons?

Thanks so much for help