To generate a new GUID press ctrl + r or F5
The same guid rendered in different formats, you can copy (ctrl + c) most suitable format for you
What is GUID?
A GUID (globally unique identifier) is a bigger, badder version of this type of ID number. You may see the term UUID tossed about (universally unique identifier), a nitpicky word for those whose numbers are unique not only within the globe, but throughout the entire universe.
GUID from Wikipedia
A globally unique identifier (GUID) is a unique reference number used as an identifier in computer software. The term "GUID" typically refers to various implementations of the universally unique identifier (UUID) standard.