I have been trying to understand the data transfer cost within the storage account from one container to another
https://azure.microsoft.com/en-us/pricing/calculator/
Here it says 10 Write operation will cost $1.00 but what does x10,000 operations mean below the box?
Does it mean if I copy 10 blobs from one container to another it will cost me $1 but what actually means x10,000 operations?
You are charged per chunks of 10,000 operations. In this case, you are going to pay $1 for 100,000 operations as you gave a 10x multiplicator.
You have the detailed pricing available at this page.