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What about licenses for my work?
If you select “no license”, only the German copyright law shall apply.
Already the name of the respective CC license type shows the most important terms for use of the content. All licenses have in common that they name the author in the way specified by him or her. The other license characteristics include conditions for disclosure, possibilities for editing and commercial use. There are 6 license types with varying combinations:

CC BY - Attribution
Grants greatest possible freedom of use. As long as the name of the author is stated in the way specified by him or her, the work may be disseminated, copied, edited, modified or even used commercially in any possible way. For the educational field, this is probably the most suitable license type. (Details)

CC BY-SA - Attribution - ShareAlike
The author insists on attribution and allows every form of dissemination or transfer or copying, editing and modification. Also use for commercial purposes is not excluded. In return, the author obliges the users to pass on any material that contains his or her material or has been created from it under the same license conditions. This license is also a good option for educational purposes. (Details)

CC BY-NC - Attribution - Non Commercial
Subject to attribution and to the fact that the work is used for non-commercial purposes only, the users may use the work in any possible way and redistribute, copy, edit or modify it. Can be quite useful for educational purposes. However, there are severe restrictions when it comes to dissemination and passing on the work. (Details)

CC BY-ND - Attribution - NoDerivs
The author agrees to the use of his or her work subject to attribution. The user is free to copy and redistribute the work and may also use it for commercial purposes. However, a disadvantage is that the user must not alter or modify the work in any way. This means that the range of use for educational purposes is severely restricted. (Details)

CC BY-NC-SA - Attribution - NonCommercial - ShareAlike
Subject to attribution and to the fact that the work is used for non-commercial purposes only, material that is licensed in this way may be copied and redistributed. It is also possible to edit and modify the material. However, the license obliges the user to pass on any material that contains the licensed material or has been created from it under exactly the same license conditions. This type of license might involve limitations for educational purposes. (Details)

CC BY-NC-ND - Attribution - NonCommercial - NoDerivs
This type of license, which is very unfavorable for educational purposes, excludes any use that involves a change to the material and requires attribution. A use for commercial purposes is not permitted either. For the field of education, this license type clearly imposes the most severe restrictions. (Details)
For more detailed information on the Creative Commons Licenses and their use, please visit the Creative Commons website or refer to the PDF document compiled by Kreutzer, Till (2016): Open Content - Ein Praxisleitfaden zur Nutzung von Creative-Commons-Lizenzen.
