and why does my teacher keep telling us to use Scholarly/Peer-Reviewed Articles?
Peer-Reviewed Articles tell you more about the author, so you know they are experts in the field.
Peer-Reviewed Articles cite the sources used in the article. This means that after you find one article that you like, chances are some of the sources the author used will be useful too! Look at their citations and track down those articles!
The Peer-Review Process means that the articles are more reliable than the ones in regular magazines and newspapers!