I'm (probably pointlessly) trying to persuade an antivaxxer that vaccines do not cause autism. They pointed to this link that references "OVER 50 PEER REVIEWED SCIENTIFIC Studies from the US National Library of Medicine National Institutes of Health". One big red flag is that the studies were not published by the US National Library of Medicine National Institutes of Health; the website is simply pointing to an index of a whole bunch of studies from various different journals. I started looking at some of the actual journals that published them and did notice some oddities (The "North American journal of medical sciences" with India as its country of publication, high submission fees that could indicate a predatory journal that will publish anything).
What's the best way to determine if a journal is reputable and likely to have high-quality content? Also, what's the best way to determine the opposite - that it is likely that anything could be published in a journal, making the content in the journal no more reliable than if it had been published on someone's personal blog?