Scholarly materials have been written by experts for advanced-level users, not usually for the general public.
Claims are backed up with evidence and the material has gone through a vetting process to ensure quality and accuracy. Statements and facts are verifiable.
If you are using the library database to look for articles, you can select the option to view only Scholarly Resources. This is a simple way of finding scholarly sources. If you are using other sources, look for the following features to identify whether or not the items are scholarly:
-was it published by a university press?
-is there a bibliography?
-are there footnotes or endnotes?
-is there a statement of peer-review?
-are there citations?
In doubt? Check with your instructor or a librarian.