Often it is second-had information.
Often simplified, incomplete, sensationalistic, or biased compared to read research.
Generally unacceptable to knowledgeable readers of your work when presented as reliable evidence of anthropological phenomena.
Citations to other work are informal, and therefore tricky to identify and find the original. Ask a librarian.
To face questions that can only be answered. . .
using specialized methods
by many researchers building upon each other's work
using knowledge gained across decades of ressearch
Dense and slow reading. The authors assume background knowledge you lack. Seek overview articles to fill in.
The articles usually have a much narrower focus than what you hope for.
Finding relevant articles is harder than finding a cool restaurant on Google. You have to do more thinking and experimenting.