Licensing refers to the granting of a licence for use.
Instructions for using CC licenses
 
The Creative Commons license system includes four basic licenses that can be combined to create seven different licenses as shown in the diagram below.
Using the questions presented in the diagram, you will end up choosing the right license for your purpose.

picture 1 - source; Theseus - Which license to choose?
CC Licenses and Their Meanings
Creative Commons (CC) licenses allow copyright holders to express the conditions under which they make their work available to others. The latest CC 4.0 licensing system is globally applicable, which also takes into account inventory and database protection. It consists of four combinable criteria that define the use of the work:
 
 
CC BY (Attribution): credit must be given to the creator.

CC BY-NC (Attribution-NonCommercial): You may share and adapt the material for non-commercial purposes only, with attribution.
 
 
CC BY-ND (Attribution-NoDerivatives): You may share the material, even commercially, but you cannot modify it.
 
 
CC BY-SA (Attribution-ShareAlike): Same as CC BY, but adaptations must be shared under the same license.
By combining these four license elements, six Creative Commons licenses are formed:
 BY Attribution
 BY Attribution
 BY-SA Attribution-ShareAlike
 BY-SA Attribution-ShareAlike
 BY-ND Attribution-NoDerivatives
 BY-ND Attribution-NoDerivatives
 BY-NC Attribution-NonCommercial
 BY-NC Attribution-NonCommercial
 BY-NC-SA Attribution-NonCommercial-ShareAlike
 BY-NC-SA Attribution-NonCommercial-ShareAlike
 BY-NC-ND Attribution-NonCommercial-NoDerivatives
 BY-NC-ND Attribution-NonCommercial-NoDerivatives
In addition, copyright-free material is marked as follows (copyright term expired or all rights waived):
 Public Domain / CC0
 Public Domain / CC0 
Source: Open Science and the Use of Images, Aalto University
Open CC licenses are:
The right to edit makes it easier to adapt the material to a different course or course, for example, enables the translation of the material into another language, which increases its international use, and enables the subtitling of video recordings and the conversion of texts into speech recordings, which improves their accessibility
Restrictive licenses: 
Materials licensed under restrictive licenses are not open educational materials in which the user by definition always has the right to copy, transmit, distribute and present the material and its modified versions. Even when publishing learning materials with more limited user rights, CC licenses are often the most convenient way to indicate what rights the user has to use the material.
Waiver of Copyright
CC0 license. The author has released his or her work for free use by waiving his or her copyrights to the extent possible. Attribution is not required. In all cases, citation is not technically practical if data is combined from different sources and there are many factors. However, it is good scientific practice to mention the authors, and it is not always even possible to waive the so-called right of paternity to a work. The CCO license is suitable for sharing data and metadata. The data does not necessarily have a clear author, and the data alone does not receive copyright protection, but the form in which it is presented (e.g. a database).
Sources:Theseus.Copyright and Creative Commons.