The ETag contains a value that you can use to perform operations conditionally. If the request version is 2011-08-18 or newer, the ETag value will be in quotes.

Returns the date and time the container was last modified. Any operation that modifies the blob, including an update of the blob's metadata or properties, changes the last-modified time of the blob.

Uniquely identifies a container's or blob's lease

Gets the approximate time remaining in the lease period, in seconds. This is only provided when breaking a lease.