Creative Commons helps you legally share your knowledge and creativity to build a more equitable, accessible, and innovative world.
With a network of staff, board, and affiliates around the world, Creative Commons provides free, easy-to-use copyright licenses to make a simple and standardized way to give the public permission to share and use your creative work–on conditions of your choice.
License Conditions
The Creative Commons copyright licenses and tools forge a balance inside the traditional “all rights reserved” setting that copyright law creates. These tools give everyone from individual creators to large companies and institutions a simple, standardized way to grant copyright permissions to their creative work.
Attribution (by)
All CC licenses require that others who use your work in any way must give you credit the way you request, but not in a way that suggests you endorse them or their use. If they want to use your work without giving you credit or for endorsement purposes, they must get your permission first.
ShareAlike (sa)
You let others copy, distribute, display, perform, and modify your work, as long as they distribute any modified work on the same terms. If they want to distribute modified works under other terms, they must get your permission first.
NonCommercial (nc)
You let others copy, distribute, display, perform, and (unless you have chosen NoDerivatives) modify and use your work for any purpose other than commercially unless they get your permission first.
NoDerivatives (nd)
You let others copy, distribute, display and perform only original copies of your work. If they want to modify your work, they must get your permission first.
Source: https://creativecommons.org/share-your-work/licensing-types-examples/
You can use CC-licensed materials as long as you follow the license conditions. One condition of all CC licenses is attribution.
How you attribute authors of the CC works will depend on whether you modify the content, if you create a derivative, if there are multiple sources, etc.