Creative Commons
The best idea is to use items that have been licensed as reusable. The Creative Commons has been set up to make it easier for people to add licenses and for others to find items they need.
Using Google to find reusable images
Do a Google search > Images > Tools > Usage Rights
then select one of the options
Using Creative Commons Search tool
Use the following search engine to find items on different sights on the web: search.creativecommons.org
Use Pixabay
All content on Pixabay is licensed with CC0 (basically "copyright free"). For full details on the CC0 license see this page on the Creative Commons website: CC0
Use the Flickr filter
Use flickr.com with one of the required filters selected.
Summary
To be safe, always use items with a Creative Commons license.
Next: Privacy
Other Considerations
Apart from copyright, and the related topic of "fair use", you also need to consider things like other people's rights (e.g. their right to privacy) and not offending others. Also you need to know how to reference any items used in your school assignments.
Privacy
Respecting other rights to privacy is covered by the Privacy Act. One important part of the act is that you cannot share information about or images of others without their permission.
Image source (License: CC0)
pixabay.com/photo-414227, 5Dec17
Not Offending Others
Moral considerations are very important. The content of your digital outcome must not offend, upset or harm others in any way. This not only applies to the images used, but also the language and information used.
Image source (License: Public Domain)
commons.wikimedia.org/wiki/File:Damon_shocked.jpg, 5Dec17
Correct Referencing
It is good practise to include the source of any item you use from the internet. There are a few accepted ways to do this. Always do it in such a way that it does not effect the design of your digital outcome.
Image source (License:
CC BY Attribution 2.0.)
flic.kr/p/e2QMS5, 5Dec17