In the case of the link you gave, I noted who writes for them (never heard of any of them) so then I opened up their page and read who is prepared to publish them.
E.g., I clicked on Our Team, then went to Luke Coffey. In his full bio I see ... ...Digital outlets for his work include Huffington Post, CNN.com, Foreign Policy Magazine, FoxNews.com, Al Jazeera, The National Interest, The Daily Caller, Politico, National Review Online, and Merco Press. That gives me the idea to be wary of his material. But that's just me.
Also below each of Our Teams entries is a link to their writings.
The more you read and learn the more you get a sense of whether to trust or not.