CC-BY-SA = Attribution + Share-Alike: https://creativecommons.org/licenses/by-sa/2.0/
CC-BY-NC = Attribution + Non-Commercial only: https://creativecommons.org/licenses/by-nc/2.0/
CC0 = some jurisdictions do not recognize the concept of "public domain", CC0 is a license that explicitly codifies the same ideas and is generally recognized everywhere (IIUC): https://creativecommons.org/share-your-work/public-domain/cc...
The clarification of "BY" <==> "Attribution" is highlighted reasonably well at https://creativecommons.org.au/learn/licences/, which also provides a comparative summary of the other CC licenses.
CC-BY-SA = Attribution + Share-Alike: https://creativecommons.org/licenses/by-sa/2.0/
CC-BY-NC = Attribution + Non-Commercial only: https://creativecommons.org/licenses/by-nc/2.0/
CC0 = some jurisdictions do not recognize the concept of "public domain", CC0 is a license that explicitly codifies the same ideas and is generally recognized everywhere (IIUC): https://creativecommons.org/share-your-work/public-domain/cc...
The clarification of "BY" <==> "Attribution" is highlighted reasonably well at https://creativecommons.org.au/learn/licences/, which also provides a comparative summary of the other CC licenses.