Moral Considerations
Anything that you "publish" must not offend, upset or harm others. What you publish must be the truth, you mustn't lie or cheat others.
What could offend?
The sorts of things that could offend others are what is written, the images, the lyrics, the videos.
Make sure that what is written
- is the truth or at least isn't trying to con others
- doesn't contain offensive language (swearing)
- isn't offensive to particular cultures, religions or age groups
Make sure that your images or videos don't offend anyone, for example they shouldn't
- have nudity
- depict cruelty or violence
Be careful that any lyrics used
- don't have offensive words (swearing)
- aren't explicit or about violence
Summary
Good behaviour. Treat others as you like to be treated.
Next: Correct Referencing
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