Watch this video:
What are the 5 principles of good design?
Explain briefly (summarise) what each of these principles means.
What does it mean when it says that good flag design is 'reductive'?
Why does a flag design need to be simple?
Why do you think flags are always primary colours?
Here's another useful video: https://www.youtube.com/watch?v=ab9DaiiQfyw