There are so many things to take in to consideration when dealing with copyright: your audience, the amount of the original work you wish to use, your intended use and so many other things. One lesson learned is that you should never assume that just because someone shared something with you that it means you have their permission to use it, even if you cite it properly. You should always clearly ask permission to use any work [unless you are 100% sure permission is not needed as in the case of work done by someone who died 70 or more years ago (in some areas it is 50 years after the end of the year in which the author died) ]. Melanie Wrobel did a great job explaining the many aspects of copyright law and I will put this knowledge to use moving forward.
Wrobel, M. (2016). A Guide to Copyright [Audio recording]. Retrieved from https://moodle.royalroads.ca/moodle/mod/page/view.php?id=347413